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20500320 = 253542709
BaseRepresentation
bin100111000110…
…0111101100000
31102120112011010
41032030331200
520222002240
62011220520
7336151461
oct116147540
942515133
1020500320
1110632215
126a47740
13432a089
142a18d68
151bee280
hex138cf60

20500320 has 48 divisors (see below), whose sum is σ = 64577520. Its totient is φ = 5466624.

The previous prime is 20500313. The next prime is 20500339. The reversal of 20500320 is 2300502.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20500296 and 20500305.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20875 + ... + 21834.

It is an arithmetic number, because the mean of its divisors is an integer number (1345365).

Almost surely, 220500320 is an apocalyptic number.

20500320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20500320 is an abundant number, since it is smaller than the sum of its proper divisors (44077200).

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

20500320 is a wasteful number, since it uses less digits than its factorization.

20500320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42727 (or 42719 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 12.

The square root of 20500320 is about 4527.7279070191. The cubic root of 20500320 is about 273.6866077855.

Adding to 20500320 its reverse (2300502), we get a palindrome (22800822).

The spelling of 20500320 in words is "twenty million, five hundred thousand, three hundred twenty".

Divisors: 1 2 3 4 5 6 8 10 12 15 16 20 24 30 32 40 48 60 80 96 120 160 240 480 42709 85418 128127 170836 213545 256254 341672 427090 512508 640635 683344 854180 1025016 1281270 1366688 1708360 2050032 2562540 3416720 4100064 5125080 6833440 10250160 20500320