20263511664 has 80 divisors (see below), whose sum is σ = 63451415040. Its totient is φ = 6140456640.

The previous prime is 20263511633. The next prime is 20263511689. The reversal of 20263511664 is 46611536202.

20263511664 is a `hidden beast` number, since 2 + 0 + 2 + 635 + 1 + 16 + 6 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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, 2127352 + ... + 2136855.

It is an arithmetic number, because the mean of its divisors is an integer number (793142688).

Almost surely, 2^20263511664 is an apocalyptic number.

20263511664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20263511664 is an abundant number, since it is smaller than the sum of its proper divisors (43187903376).

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

20263511664 is a wasteful number, since it uses less digits than its factorization.

20263511664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4264235 (or 4264223 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 20263511664 in words is "twenty billion, two hundred sixty-three million, five hundred eleven thousand, six hundred sixty-four".