20465554644 has 36 divisors (see below), whose sum is σ = 51876508320. Its totient is φ = 6802844880.

The previous prime is 20465554631. The next prime is 20465554661. The reversal of 20465554644 is 44645556402.

20465554644 is a `hidden beast` number, since 2 + 0 + 4 + 65 + 5 + 546 + 44 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20465554644.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 778842 + ... + 804689.

It is an arithmetic number, because the mean of its divisors is an integer number (1441014120).

Almost surely, 2^20465554644 is an apocalyptic number.

It is an amenable number.

20465554644 is an abundant number, since it is smaller than the sum of its proper divisors (31410953676).

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

20465554644 is a wasteful number, since it uses less digits than its factorization.

20465554644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1583900 (or 1583895 counting only the distinct ones).

The product of its (nonzero) digits is 2304000, while the sum is 45.

The spelling of 20465554644 in words is "twenty billion, four hundred sixty-five million, five hundred fifty-four thousand, six hundred forty-four".