20640163652 has 6 divisors (see below), whose sum is σ = 36120286398. Its totient is φ = 10320081824.

The previous prime is 20640163627. The next prime is 20640163667. The reversal of 20640163652 is 25636104602.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16867255876 + 3772907776 = 129874^2 + 61424^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2580020453 + ... + 2580020460.

It is an arithmetic number, because the mean of its divisors is an integer number (6020047733).

Almost surely, 2^20640163652 is an apocalyptic number.

It is an amenable number.

20640163652 is a deficient number, since it is larger than the sum of its proper divisors (15480122746).

20640163652 is a wasteful number, since it uses less digits than its factorization.

20640163652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5160040917 (or 5160040915 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The spelling of 20640163652 in words is "twenty billion, six hundred forty million, one hundred sixty-three thousand, six hundred fifty-two".