20556511026 has 16 divisors (see below), whose sum is σ = 41574967200. Its totient is φ = 6775179488.

The previous prime is 20556511009. The next prime is 20556511037. The reversal of 20556511026 is 62011565502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19247136 + ... + 19248203.

It is an arithmetic number, because the mean of its divisors is an integer number (2598435450).

Almost surely, 2^20556511026 is an apocalyptic number.

20556511026 is an abundant number, since it is smaller than the sum of its proper divisors (21018456174).

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

20556511026 is a wasteful number, since it uses less digits than its factorization.

20556511026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38495433.

The product of its (nonzero) digits is 18000, while the sum is 33.

The spelling of 20556511026 in words is "twenty billion, five hundred fifty-six million, five hundred eleven thousand, twenty-six".