20640676 has 24 divisors (see below), whose sum is σ = 41666240. Its totient is φ = 8763552.

The previous prime is 20640667. The next prime is 20640679. The reversal of 20640676 is 67604602.

It is not an unprimeable number, because it can be changed into a prime (20640679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 330 + ... + 6433.

Almost surely, 2^20640676 is an apocalyptic number.

It is an amenable number.

20640676 is an abundant number, since it is smaller than the sum of its proper divisors (21025564).

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

20640676 is a wasteful number, since it uses less digits than its factorization.

20640676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6883 (or 6881 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 20640676 is about 4543.2010741326. The cubic root of 20640676 is about 274.3097886752.

It can be divided in two parts, 20640 and 676, that added together give a square (21316 = 146²).

The spelling of 20640676 in words is "twenty million, six hundred forty thousand, six hundred seventy-six".