20684435756 has 12 divisors (see below), whose sum is σ = 36214779720. Its totient is φ = 10337355840.

The previous prime is 20684435731. The next prime is 20684435767. The reversal of 20684435756 is 65753448602.

It is a happy number.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

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, 1205930 + ... + 1222961.

It is an arithmetic number, because the mean of its divisors is an integer number (3017898310).

Almost surely, 2^20684435756 is an apocalyptic number.

It is an amenable number.

20684435756 is a deficient number, since it is larger than the sum of its proper divisors (15530343964).

20684435756 is a wasteful number, since it uses less digits than its factorization.

20684435756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2431024 (or 2431022 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 50.

The spelling of 20684435756 in words is "twenty billion, six hundred eighty-four million, four hundred thirty-five thousand, seven hundred fifty-six".