20457885 has 64 divisors (see below), whose sum is σ = 40407552. Its totient is φ = 8626176.

The previous prime is 20457863. The next prime is 20457901. The reversal of 20457885 is 58875402.

It is not a de Polignac number, because 20457885 - 2⁶ = 20457821 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 130227 + ... + 130383.

It is an arithmetic number, because the mean of its divisors is an integer number (631368).

Almost surely, 2^20457885 is an apocalyptic number.

It is an amenable number.

20457885 is a deficient number, since it is larger than the sum of its proper divisors (19949667).

20457885 is a wasteful number, since it uses less digits than its factorization.

20457885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262.

The product of its (nonzero) digits is 89600, while the sum is 39.

The square root of 20457885 is about 4523.0393542396. The cubic root of 20457885 is about 273.4976365257.

The spelling of 20457885 in words is "twenty million, four hundred fifty-seven thousand, eight hundred eighty-five".