20501858016 has 72 divisors (see below), whose sum is σ = 61731712224. Its totient is φ = 6431953920.

The previous prime is 20501857991. The next prime is 20501858053. The reversal of 20501858016 is 61085810502.

20501858016 is a `hidden beast` number, since 2 + 0 + 50 + 18 + 580 + 16 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

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 11 ways as a sum of consecutive naturals, for example, 2088840 + ... + 2098631.

It is an arithmetic number, because the mean of its divisors is an integer number (857384892).

Almost surely, 2^20501858016 is an apocalyptic number.

It is an amenable number.

20501858016 is an abundant number, since it is smaller than the sum of its proper divisors (41229854208).

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

20501858016 is a wasteful number, since it uses less digits than its factorization.

20501858016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4187504 (or 4187493 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 36.

The spelling of 20501858016 in words is "twenty billion, five hundred one million, eight hundred fifty-eight thousand, sixteen".