20797975 has 12 divisors (see below), whose sum is σ = 28134360. Its totient is φ = 15125600.

The previous prime is 20797961. The next prime is 20797981. The reversal of 20797975 is 57979702.

It is a happy number.

It is not a de Polignac number, because 20797975 - 2⁵ = 20797943 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37540 + ... + 38089.

It is an arithmetic number, because the mean of its divisors is an integer number (2344530).

Almost surely, 2^20797975 is an apocalyptic number.

20797975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20797975 is a deficient number, since it is larger than the sum of its proper divisors (7336385).

20797975 is a wasteful number, since it uses less digits than its factorization.

20797975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75650 (or 75645 counting only the distinct ones).

The product of its (nonzero) digits is 277830, while the sum is 46.

The square root of 20797975 is about 4560.4796896818. The cubic root of 20797975 is about 275.0048483994.

The spelling of 20797975 in words is "twenty million, seven hundred ninety-seven thousand, nine hundred seventy-five".