20845924 has 24 divisors (see below), whose sum is σ = 39932928. Its totient is φ = 9443040.

The previous prime is 20845921. The next prime is 20845933. The reversal of 20845924 is 42954802.

It is a self number, because there is not a number n which added to its sum of digits gives 20845924.

It is not an unprimeable number, because it can be changed into a prime (20845921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16234 + ... + 17470.

It is an arithmetic number, because the mean of its divisors is an integer number (1663872).

Almost surely, 2^20845924 is an apocalyptic number.

It is an amenable number.

20845924 is a deficient number, since it is larger than the sum of its proper divisors (19087004).

20845924 is a wasteful number, since it uses less digits than its factorization.

20845924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1635 (or 1633 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 20845924 is about 4565.7336759824. The cubic root of 20845924 is about 275.2160241988.

It can be divided in two parts, 2084 and 5924, that added together give a palindrome (8008).

The spelling of 20845924 in words is "twenty million, eight hundred forty-five thousand, nine hundred twenty-four".