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20550531400 = 2352722096993
BaseRepresentation
bin10011001000111010…
…000011100101001000
31222001012110011100121
4103020322003211020
5314041414001100
613235113113024
71325155430500
oct231072034510
958035404317
1020550531400
11879626a453
123b963b8774
131c26772c69
14dcd472a00
1580426651a
hex4c8e83948

20550531400 has 72 divisors (see below), whose sum is σ = 55580825970. Its totient is φ = 7045893120.

The previous prime is 20550531389. The next prime is 20550531401. The reversal of 20550531400 is 413505502.

It can be written as a sum of positive squares in 3 ways, for example, as 20069255556 + 481275844 = 141666^2 + 21938^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (20550531401) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1038697 + ... + 1058296.

Almost surely, 220550531400 is an apocalyptic number.

20550531400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20550531400 is an abundant number, since it is smaller than the sum of its proper divisors (35030294570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20550531400 is a wasteful number, since it uses less digits than its factorization.

20550531400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2097023 (or 2097007 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The spelling of 20550531400 in words is "twenty billion, five hundred fifty million, five hundred thirty-one thousand, four hundred".

Divisors: 1 2 4 5 7 8 10 14 20 25 28 35 40 49 50 56 70 98 100 140 175 196 200 245 280 350 392 490 700 980 1225 1400 1960 2450 4900 9800 2096993 4193986 8387972 10484965 14678951 16775944 20969930 29357902 41939860 52424825 58715804 73394755 83879720 102752657 104849650 117431608 146789510 205505314 209699300 293579020 366973775 411010628 419398600 513763285 587158040 733947550 822021256 1027526570 1467895100 2055053140 2568816425 2935790200 4110106280 5137632850 10275265700 20550531400