20464278616 has 16 divisors (see below), whose sum is σ = 38495512440. Its totient is φ = 10198808640.

The previous prime is 20464278587. The next prime is 20464278631. The reversal of 20464278616 is 61687246402.

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, 4163725 + ... + 4168636.

Almost surely, 2^20464278616 is an apocalyptic number.

It is an amenable number.

20464278616 is a deficient number, since it is larger than the sum of its proper divisors (18031233824).

20464278616 is a wasteful number, since it uses less digits than its factorization.

20464278616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8332674 (or 8332670 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 46.

The spelling of 20464278616 in words is "twenty billion, four hundred sixty-four million, two hundred seventy-eight thousand, six hundred sixteen".