20432621 has 16 divisors (see below), whose sum is σ = 23296128. Its totient is φ = 17755200.

The previous prime is 20432609. The next prime is 20432663. The reversal of 20432621 is 12623402.

It is a cyclic number.

It is not a de Polignac number, because 20432621 - 2¹⁸ = 20170477 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20432593 and 20432602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20432681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24416 + ... + 25238.

It is an arithmetic number, because the mean of its divisors is an integer number (1456008).

Almost surely, 2^20432621 is an apocalyptic number.

It is an amenable number.

20432621 is a deficient number, since it is larger than the sum of its proper divisors (2863507).

20432621 is a wasteful number, since it uses less digits than its factorization.

20432621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932.

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

The square root of 20432621 is about 4520.2456791639. The cubic root of 20432621 is about 273.3850069203.

It can be divided in two parts, 2043 and 2621, that added together give a palindrome (4664).

The spelling of 20432621 in words is "twenty million, four hundred thirty-two thousand, six hundred twenty-one".