20070557 has 16 divisors (see below), whose sum is σ = 23051952. Its totient is φ = 17310720.

The previous prime is 20070553. The next prime is 20070563. The reversal of 20070557 is 75507002.

It can be written as a sum of positive squares in 8 ways, for example, as 657721 + 19412836 = 811^2 + 4406^2 .

It is a cyclic number.

It is not a de Polignac number, because 20070557 - 2² = 20070553 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20070553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43307 + ... + 43767.

It is an arithmetic number, because the mean of its divisors is an integer number (1440747).

Almost surely, 2^20070557 is an apocalyptic number.

It is an amenable number.

20070557 is a deficient number, since it is larger than the sum of its proper divisors (2981395).

20070557 is a wasteful number, since it uses less digits than its factorization.

20070557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688.

The product of its (nonzero) digits is 2450, while the sum is 26.

The square root of 20070557 is about 4480.0175222872. The cubic root of 20070557 is about 271.7605889676.

Adding to 20070557 its reverse (75507002), we get a palindrome (95577559).

The spelling of 20070557 in words is "twenty million, seventy thousand, five hundred fifty-seven".