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20312442420 = 2235338540707
BaseRepresentation
bin10010111010101101…
…110100011000110100
31221102121102222200020
4102322231310120310
5313044441124140
613155330045140
71316234624514
oct227255643064
957377388606
1020312442420
1186839316a6
123b2a7197b0
131bb9340bca
14da99b7844
157dd3d66d0
hex4bab74634

20312442420 has 24 divisors (see below), whose sum is σ = 56874838944. Its totient is φ = 5416651296.

The previous prime is 20312442407. The next prime is 20312442467. The reversal of 20312442420 is 2424421302.

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, 169270294 + ... + 169270413.

It is an arithmetic number, because the mean of its divisors is an integer number (2369784956).

Almost surely, 220312442420 is an apocalyptic number.

20312442420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20312442420 is an abundant number, since it is smaller than the sum of its proper divisors (36562396524).

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

20312442420 is a wasteful number, since it uses less digits than its factorization.

20312442420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338540719 (or 338540717 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 20312442420 its reverse (2424421302), we get a palindrome (22736863722).

The spelling of 20312442420 in words is "twenty billion, three hundred twelve million, four hundred forty-two thousand, four hundred twenty".

Divisors: 1 2 3 4 5 6 10 12 15 20 30 60 338540707 677081414 1015622121 1354162828 1692703535 2031244242 3385407070 4062488484 5078110605 6770814140 10156221210 20312442420