20211057 has 24 divisors (see below), whose sum is σ = 30426240. Its totient is φ = 12912480.

The previous prime is 20211031. The next prime is 20211077. The reversal of 20211057 is 75011202.

It is not a de Polignac number, because 20211057 - 2⁷ = 20210929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20211007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54888 + ... + 55254.

It is an arithmetic number, because the mean of its divisors is an integer number (1267760).

Almost surely, 2^20211057 is an apocalyptic number.

It is an amenable number.

20211057 is a deficient number, since it is larger than the sum of its proper divisors (10215183).

20211057 is a wasteful number, since it uses less digits than its factorization.

20211057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613 (or 610 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 20211057 is about 4495.6709176718. The cubic root of 20211057 is about 272.3932505589.

Adding to 20211057 its reverse (75011202), we get a palindrome (95222259).

The spelling of 20211057 in words is "twenty million, two hundred eleven thousand, fifty-seven".