20646486 has 24 divisors (see below), whose sum is σ = 51124944. Its totient is φ = 5898960.

The previous prime is 20646467. The next prime is 20646497. The reversal of 20646486 is 68464602.

It is a happy number.

20646486 is a `hidden beast` number, since 2 + 0 + 6 + 4 + 648 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 20646486.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81805 + ... + 82056.

It is an arithmetic number, because the mean of its divisors is an integer number (2130206).

Almost surely, 2^20646486 is an apocalyptic number.

20646486 is an abundant number, since it is smaller than the sum of its proper divisors (30478458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20646486 is a wasteful number, since it uses less digits than its factorization.

20646486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163876 (or 163873 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The square root of 20646486 is about 4543.8404461424. The cubic root of 20646486 is about 274.3355241107.

The spelling of 20646486 in words is "twenty million, six hundred forty-six thousand, four hundred eighty-six".