20457772 has 6 divisors (see below), whose sum is σ = 35801108. Its totient is φ = 10228884.

The previous prime is 20457751. The next prime is 20457791. The reversal of 20457772 is 27775402.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2557218 + ... + 2557225.

Almost surely, 2^20457772 is an apocalyptic number.

It is an amenable number.

20457772 is a deficient number, since it is larger than the sum of its proper divisors (15343336).

20457772 is a wasteful number, since it uses less digits than its factorization.

20457772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5114447 (or 5114445 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 34.

The square root of 20457772 is about 4523.0268626220. The cubic root of 20457772 is about 273.4971329662.

The spelling of 20457772 in words is "twenty million, four hundred fifty-seven thousand, seven hundred seventy-two".