20457764 has 12 divisors (see below), whose sum is σ = 37357824. Its totient is φ = 9784104.

The previous prime is 20457751. The next prime is 20457791. The reversal of 20457764 is 46775402.

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, 111092 + ... + 111275.

It is an arithmetic number, because the mean of its divisors is an integer number (3113152).

Almost surely, 2^20457764 is an apocalyptic number.

It is an amenable number.

20457764 is a deficient number, since it is larger than the sum of its proper divisors (16900060).

20457764 is a wasteful number, since it uses less digits than its factorization.

20457764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222394 (or 222392 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 35.

The square root of 20457764 is about 4523.0259782584. The cubic root of 20457764 is about 273.4970973159.

The spelling of 20457764 in words is "twenty million, four hundred fifty-seven thousand, seven hundred sixty-four".