20000975 has 12 divisors (see below), whose sum is σ = 25036344. Its totient is φ = 15849120.

The previous prime is 20000971. The next prime is 20001001. The reversal of 20000975 is 57900002.

It is not a de Polignac number, because 20000975 - 2² = 20000971 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20000975.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000971) 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, 1064 + ... + 6413.

It is an arithmetic number, because the mean of its divisors is an integer number (2086362).

Almost surely, 2^20000975 is an apocalyptic number.

20000975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20000975 is a deficient number, since it is larger than the sum of its proper divisors (5035369).

20000975 is a wasteful number, since it uses less digits than its factorization.

20000975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7594 (or 7589 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 23.

The square root of 20000975 is about 4472.2449619850. The cubic root of 20000975 is about 271.4461725164.

Adding to 20000975 its reverse (57900002), we get a palindrome (77900977).

The spelling of 20000975 in words is "twenty million, nine hundred seventy-five", and thus it is an aban number.