20454645402 has 12 divisors (see below), whose sum is σ = 44318398410. Its totient is φ = 6818215128.

The previous prime is 20454645391. The next prime is 20454645439.

20454645402 is a `hidden beast` number, since 2 + 0 + 4 + 5 + 4 + 645 + 4 + 0 + 2 = 666.

20454645402 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 16860762801 + 3593882601 = 129849^2 + 59949^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 568184577 + ... + 568184612.

Almost surely, 2^20454645402 is an apocalyptic number.

20454645402 is an abundant number, since it is smaller than the sum of its proper divisors (23863753008).

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

20454645402 is a wasteful number, since it uses less digits than its factorization.

20454645402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136369197 (or 1136369194 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 36.

It can be divided in two parts, 20454 and 645402, that added together give a square (665856 = 816²).

The spelling of 20454645402 in words is "twenty billion, four hundred fifty-four million, six hundred forty-five thousand, four hundred two".