20555445156 has 24 divisors (see below), whose sum is σ = 49509890304. Its totient is φ = 6630788640.

The previous prime is 20555445149. The next prime is 20555445199. The reversal of 20555445156 is 65154455502.

It is a super-2 number, since 2×20555445156² (a number of 21 digits) contains 22 as substring.

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, 27627915 + ... + 27628658.

It is an arithmetic number, because the mean of its divisors is an integer number (2062912096).

Almost surely, 2^20555445156 is an apocalyptic number.

It is an amenable number.

20555445156 is an abundant number, since it is smaller than the sum of its proper divisors (28954445148).

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

20555445156 is a wasteful number, since it uses less digits than its factorization.

20555445156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55256611 (or 55256609 counting only the distinct ones).

The product of its (nonzero) digits is 600000, while the sum is 42.

The spelling of 20555445156 in words is "twenty billion, five hundred fifty-five million, four hundred forty-five thousand, one hundred fifty-six".