20021924 has 24 divisors (see below), whose sum is σ = 38196480. Its totient is φ = 9127584.

The previous prime is 20021917. The next prime is 20021951. The reversal of 20021924 is 42912002.

It is a junction number, because it is equal to n+sod(n) for n = 20021896 and 20021905.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1997 + ... + 6635.

It is an arithmetic number, because the mean of its divisors is an integer number (1591520).

Almost surely, 2^20021924 is an apocalyptic number.

It is an amenable number.

20021924 is a deficient number, since it is larger than the sum of its proper divisors (18174556).

20021924 is a wasteful number, since it uses less digits than its factorization.

20021924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4739 (or 4737 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 20021924 is about 4474.5864613392. The cubic root of 20021924 is about 271.5409102591.

Adding to 20021924 its reverse (42912002), we get a palindrome (62933926).

The spelling of 20021924 in words is "twenty million, twenty-one thousand, nine hundred twenty-four".