20637852816 has 160 divisors (see below), whose sum is σ = 62146839808. Its totient is φ = 5779537920.

The previous prime is 20637852799. The next prime is 20637852841. The reversal of 20637852816 is 61825873602.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6413640 + ... + 6416856.

Almost surely, 2^20637852816 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 20637852816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31073419904).

20637852816 is an abundant number, since it is smaller than the sum of its proper divisors (41508986992).

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

20637852816 is a wasteful number, since it uses less digits than its factorization.

20637852816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3609 (or 3603 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 48.

The spelling of 20637852816 in words is "twenty billion, six hundred thirty-seven million, eight hundred fifty-two thousand, eight hundred sixteen".