20775924 has 72 divisors (see below), whose sum is σ = 57238272. Its totient is φ = 6315840.

The previous prime is 20775901. The next prime is 20775941. The reversal of 20775924 is 42957702.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47989 + ... + 48419.

It is an arithmetic number, because the mean of its divisors is an integer number (794976).

Almost surely, 2^20775924 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20775924, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28619136).

20775924 is an abundant number, since it is smaller than the sum of its proper divisors (36462348).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20775924 is a wasteful number, since it uses less digits than its factorization.

20775924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557 (or 552 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 20775924 is about 4558.0614300380. The cubic root of 20775924 is about 274.9076229670.

It can be divided in two parts, 2077 and 5924, that added together give a triangular number (8001 = T₁₂₆).

The spelling of 20775924 in words is "twenty million, seven hundred seventy-five thousand, nine hundred twenty-four".