20640802 has 64 divisors (see below), whose sum is σ = 41287680. Its totient is φ = 7511616.

The previous prime is 20640793. The next prime is 20640827. The reversal of 20640802 is 20804602.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 162463 + ... + 162589.

It is an arithmetic number, because the mean of its divisors is an integer number (645120).

Almost surely, 2^20640802 is an apocalyptic number.

20640802 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

20640802 is a wasteful number, since it uses less digits than its factorization.

20640802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 20640802 is about 4543.2149409862. The cubic root of 20640802 is about 274.3103468443.

The spelling of 20640802 in words is "twenty million, six hundred forty thousand, eight hundred two".