20015975 has 12 divisors (see below), whose sum is σ = 28365744. Its totient is φ = 13725120.

The previous prime is 20015923. The next prime is 20015977. The reversal of 20015975 is 57951002.

It is not a de Polignac number, because 20015975 - 2¹⁸ = 19753831 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 (20015977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57014 + ... + 57363.

It is an arithmetic number, because the mean of its divisors is an integer number (2363812).

Almost surely, 2^20015975 is an apocalyptic number.

20015975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20015975 is a deficient number, since it is larger than the sum of its proper divisors (8349769).

20015975 is a wasteful number, since it uses less digits than its factorization.

20015975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114394 (or 114389 counting only the distinct ones).

The product of its (nonzero) digits is 3150, while the sum is 29.

The square root of 20015975 is about 4473.9216577853. The cubic root of 20015975 is about 271.5140137948.

Adding to 20015975 its reverse (57951002), we get a palindrome (77966977).

The spelling of 20015975 in words is "twenty million, fifteen thousand, nine hundred seventy-five".