20399974694 has 32 divisors (see below), whose sum is σ = 33753563136. Its totient is φ = 9169917120.

The previous prime is 20399974667. The next prime is 20399974747. The reversal of 20399974694 is 49647999302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 862859 + ... + 886185.

It is an arithmetic number, because the mean of its divisors is an integer number (1054798848).

Almost surely, 2^20399974694 is an apocalyptic number.

20399974694 is a deficient number, since it is larger than the sum of its proper divisors (13353588442).

20399974694 is a wasteful number, since it uses less digits than its factorization.

20399974694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23780.

The product of its (nonzero) digits is 26453952, while the sum is 62.

The spelling of 20399974694 in words is "twenty billion, three hundred ninety-nine million, nine hundred seventy-four thousand, six hundred ninety-four".