20653655402 has 16 divisors (see below), whose sum is σ = 32805586440. Its totient is φ = 9718560768.

The previous prime is 20653655369. The next prime is 20653655417. The reversal of 20653655402 is 20455635602.

It can be written as a sum of positive squares in 4 ways, for example, as 17379412561 + 3274242841 = 131831^2 + 57221^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 662624 + ... + 693092.

Almost surely, 2^20653655402 is an apocalyptic number.

20653655402 is a deficient number, since it is larger than the sum of its proper divisors (12151931038).

20653655402 is a wasteful number, since it uses less digits than its factorization.

20653655402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50425.

The product of its (nonzero) digits is 216000, while the sum is 38.

The spelling of 20653655402 in words is "twenty billion, six hundred fifty-three million, six hundred fifty-five thousand, four hundred two".