22420981 has 4 divisors (see below), whose sum is σ = 24459264. Its totient is φ = 20382700.

The previous prime is 22420949. The next prime is 22420987. The reversal of 22420981 is 18902422.

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 22420981 - 2⁵ = 22420949 is a prime.

It is a super-2 number, since 2×22420981² = 1005400778004722, 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 (22420987) 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, 1019125 + ... + 1019146.

It is an arithmetic number, because the mean of its divisors is an integer number (6114816).

Almost surely, 2^22420981 is an apocalyptic number.

It is an amenable number.

22420981 is a deficient number, since it is larger than the sum of its proper divisors (2038283).

22420981 is a wasteful number, since it uses less digits than its factorization.

22420981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2038282.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 22420981 is about 4735.0798303725. The cubic root of 22420981 is about 281.9799333507.

The spelling of 22420981 in words is "twenty-two million, four hundred twenty thousand, nine hundred eighty-one".