20154262656 has 128 divisors (see below), whose sum is σ = 58455302400. Its totient is φ = 6101734400.

The previous prime is 20154262619. The next prime is 20154262663. The reversal of 20154262656 is 65626245102.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8358091 + ... + 8360501.

It is an arithmetic number, because the mean of its divisors is an integer number (456682050).

Almost surely, 2^20154262656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20154262656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29227651200).

20154262656 is an abundant number, since it is smaller than the sum of its proper divisors (38301039744).

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

20154262656 is a wasteful number, since it uses less digits than its factorization.

20154262656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4418 (or 4406 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 20154262656 in words is "twenty billion, one hundred fifty-four million, two hundred sixty-two thousand, six hundred fifty-six".