20015057 has 4 divisors (see below), whose sum is σ = 20660736. Its totient is φ = 19369380.

The previous prime is 20015053. The next prime is 20015059. The reversal of 20015057 is 75051002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20015057 - 2² = 20015053 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20015053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322793 + ... + 322854.

It is an arithmetic number, because the mean of its divisors is an integer number (5165184).

Almost surely, 2^20015057 is an apocalyptic number.

It is an amenable number.

20015057 is a deficient number, since it is larger than the sum of its proper divisors (645679).

20015057 is an equidigital number, since it uses as much as digits as its factorization.

20015057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645678.

The product of its (nonzero) digits is 350, while the sum is 20.

The square root of 20015057 is about 4473.8190620543. The cubic root of 20015057 is about 271.5098628824.

Adding to 20015057 its reverse (75051002), we get a palindrome (95066059).

The spelling of 20015057 in words is "twenty million, fifteen thousand, fifty-seven".