22720431 has 4 divisors (see below), whose sum is σ = 30293912. Its totient is φ = 15146952.

The previous prime is 22720421. The next prime is 22720441. The reversal of 22720431 is 13402722.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (22720421) and next prime (22720441).

It is not a de Polignac number, because 22720431 - 2¹¹ = 22718383 is a prime.

It is a super-2 number, since 2×22720431² = 1032435969651522, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a junction number, because it is equal to n+sod(n) for n = 22720398 and 22720407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22720421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3786736 + ... + 3786741.

It is an arithmetic number, because the mean of its divisors is an integer number (7573478).

Almost surely, 2^22720431 is an apocalyptic number.

22720431 is a deficient number, since it is larger than the sum of its proper divisors (7573481).

22720431 is an equidigital number, since it uses as much as digits as its factorization.

22720431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7573480.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 22720431 is about 4766.5953258065. The cubic root of 22720431 is about 283.2297409835.

The spelling of 22720431 in words is "twenty-two million, seven hundred twenty thousand, four hundred thirty-one".