20824975 has 12 divisors (see below), whose sum is σ = 25920216. Its totient is φ = 16597280.

The previous prime is 20824961. The next prime is 20824981. The reversal of 20824975 is 57942802.

It is a de Polignac number, because none of the positive numbers 2^k-20824975 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, 5904 + ... + 8746.

It is an arithmetic number, because the mean of its divisors is an integer number (2160018).

Almost surely, 2^20824975 is an apocalyptic number.

20824975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20824975 is a deficient number, since it is larger than the sum of its proper divisors (5095241).

20824975 is a wasteful number, since it uses less digits than its factorization.

20824975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3146 (or 3141 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 20824975 is about 4563.4389444804. The cubic root of 20824975 is about 275.1238010075.

The spelling of 20824975 in words is "twenty million, eight hundred twenty-four thousand, nine hundred seventy-five".