20213624 has 16 divisors (see below), whose sum is σ = 38094000. Its totient is φ = 10055232.

The previous prime is 20213623. The next prime is 20213639. The reversal of 20213624 is 42631202.

It is a junction number, because it is equal to n+sod(n) for n = 20213596 and 20213605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20213623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4757 + ... + 7940.

It is an arithmetic number, because the mean of its divisors is an integer number (2380875).

Almost surely, 2^20213624 is an apocalyptic number.

It is an amenable number.

20213624 is a deficient number, since it is larger than the sum of its proper divisors (17880376).

20213624 is a wasteful number, since it uses less digits than its factorization.

20213624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12902 (or 12898 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 20213624 is about 4495.9564054826. The cubic root of 20213624 is about 272.4047822644.

Adding to 20213624 its reverse (42631202), we get a palindrome (62844826).

The spelling of 20213624 in words is "twenty million, two hundred thirteen thousand, six hundred twenty-four".