20057517 has 16 divisors (see below), whose sum is σ = 29789760. Its totient is φ = 13338000.

The previous prime is 20057509. The next prime is 20057519. The reversal of 20057517 is 71575002.

It is not a de Polignac number, because 20057517 - 2³ = 20057509 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20057519) 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, 14767 + ... + 16067.

It is an arithmetic number, because the mean of its divisors is an integer number (1861860).

Almost surely, 2^20057517 is an apocalyptic number.

20057517 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20057517 is a deficient number, since it is larger than the sum of its proper divisors (9732243).

20057517 is a wasteful number, since it uses less digits than its factorization.

20057517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1881 (or 1875 counting only the distinct ones).

The product of its (nonzero) digits is 2450, while the sum is 27.

The square root of 20057517 is about 4478.5619343713. The cubic root of 20057517 is about 271.7017212137.

The spelling of 20057517 in words is "twenty million, fifty-seven thousand, five hundred seventeen".