22620181 has 4 divisors (see below), whose sum is σ = 22635712. Its totient is φ = 22604652.

The previous prime is 22620167. The next prime is 22620211. The reversal of 22620181 is 18102622.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22620181 - 2⁷ = 22620053 is a prime.

It is a super-2 number, since 2×22620181² = 1023345176945522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22620161) 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, 5325 + ... + 8578.

It is an arithmetic number, because the mean of its divisors is an integer number (5658928).

Almost surely, 2^22620181 is an apocalyptic number.

It is an amenable number.

22620181 is a deficient number, since it is larger than the sum of its proper divisors (15531).

22620181 is a wasteful number, since it uses less digits than its factorization.

22620181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15530.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 22620181 is about 4756.0678085999. The cubic root of 22620181 is about 282.8125592686.

It can be divided in two parts, 22620 and 181, that added together give a square (22801 = 151²).

The spelling of 22620181 in words is "twenty-two million, six hundred twenty thousand, one hundred eighty-one".