20506553464 has 16 divisors (see below), whose sum is σ = 38730445200. Its totient is φ = 10178434752.

The previous prime is 20506553449. The next prime is 20506553519. The reversal of 20506553464 is 46435560502.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9354084 + ... + 9356275.

It is an arithmetic number, because the mean of its divisors is an integer number (2420652825).

Almost surely, 2^20506553464 is an apocalyptic number.

It is an amenable number.

20506553464 is a deficient number, since it is larger than the sum of its proper divisors (18223891736).

20506553464 is a wasteful number, since it uses less digits than its factorization.

20506553464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18710502 (or 18710498 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 40.

The spelling of 20506553464 in words is "twenty billion, five hundred six million, five hundred fifty-three thousand, four hundred sixty-four".