20930975 has 12 divisors (see below), whose sum is σ = 27951336. Its totient is φ = 15456480.

The previous prime is 20930969. The next prime is 20930999. The reversal of 20930975 is 57903902.

It is not a de Polignac number, because 20930975 - 2¹⁸ = 20668831 is a prime.

It is a Duffinian number.

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, 31877 + ... + 32526.

It is an arithmetic number, because the mean of its divisors is an integer number (2329278).

Almost surely, 2^20930975 is an apocalyptic number.

20930975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20930975 is a deficient number, since it is larger than the sum of its proper divisors (7020361).

20930975 is a wasteful number, since it uses less digits than its factorization.

20930975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64426 (or 64421 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 35.

The square root of 20930975 is about 4575.0382512062. The cubic root of 20930975 is about 275.5898084793.

The spelling of 20930975 in words is "twenty million, nine hundred thirty thousand, nine hundred seventy-five".