20645251500432 has 160 divisors (see below), whose sum is σ = 58301236482048. Its totient is φ = 6256732635648.

The previous prime is 20645251500413. The next prime is 20645251500473. The reversal of 20645251500432 is 23400515254602.

It is a Harshad number since it is a multiple of its sum of digits (39).

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, 357136843 + ... + 357194645.

Almost surely, 2^{20645251500432} 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 20645251500432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29150618241024).

20645251500432 is an abundant number, since it is smaller than the sum of its proper divisors (37655984981616).

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

20645251500432 is a wasteful number, since it uses less digits than its factorization.

20645251500432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66437 (or 66431 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 39.

The spelling of 20645251500432 in words is "twenty trillion, six hundred forty-five billion, two hundred fifty-one million, five hundred thousand, four hundred thirty-two".