20226621 has 16 divisors (see below), whose sum is σ = 28783040. Its totient is φ = 12597120.

The previous prime is 20226599. The next prime is 20226623. The reversal of 20226621 is 12662202.

It is not a de Polignac number, because 20226621 - 2⁵ = 20226589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20226623) 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, 1731 + ... + 6591.

It is an arithmetic number, because the mean of its divisors is an integer number (1798940).

Almost surely, 2^20226621 is an apocalyptic number.

It is an amenable number.

20226621 is a deficient number, since it is larger than the sum of its proper divisors (8556419).

20226621 is a wasteful number, since it uses less digits than its factorization.

20226621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4956.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 20226621 is about 4497.4015831366. The cubic root of 20226621 is about 272.4631535624.

Adding to 20226621 its reverse (12662202), we get a palindrome (32888823).

The spelling of 20226621 in words is "twenty million, two hundred twenty-six thousand, six hundred twenty-one".