20855913942 has 32 divisors (see below), whose sum is σ = 41957967744. Its totient is φ = 6911049600.

The previous prime is 20855913929. The next prime is 20855913943. The reversal of 20855913942 is 24931955802.

It is a happy number.

It is a super-2 number, since 2×20855913942² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20855913891 and 20855913900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20855913943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 836517 + ... + 861087.

It is an arithmetic number, because the mean of its divisors is an integer number (1311186492).

Almost surely, 2^20855913942 is an apocalyptic number.

20855913942 is an abundant number, since it is smaller than the sum of its proper divisors (21102053802).

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

20855913942 is a wasteful number, since it uses less digits than its factorization.

20855913942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25404.

The product of its (nonzero) digits is 777600, while the sum is 48.

The spelling of 20855913942 in words is "twenty billion, eight hundred fifty-five million, nine hundred thirteen thousand, nine hundred forty-two".