20500975 has 24 divisors (see below), whose sum is σ = 27998208. Its totient is φ = 14767200.

The previous prime is 20500973. The next prime is 20501009. The reversal of 20500975 is 57900502.

It is not a de Polignac number, because 20500975 - 2¹ = 20500973 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 (20500973) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34632 + ... + 35218.

It is an arithmetic number, because the mean of its divisors is an integer number (1166592).

Almost surely, 2^20500975 is an apocalyptic number.

20500975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20500975 is a deficient number, since it is larger than the sum of its proper divisors (7497233).

20500975 is a wasteful number, since it uses less digits than its factorization.

20500975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735 (or 730 counting only the distinct ones).

The product of its (nonzero) digits is 3150, while the sum is 28.

The square root of 20500975 is about 4527.8002385264. The cubic root of 20500975 is about 273.6895225826.

The spelling of 20500975 in words is "twenty million, five hundred thousand, nine hundred seventy-five".