22497720 has 64 divisors (see below), whose sum is σ = 77137920. Its totient is φ = 5142144.

The previous prime is 22497719. The next prime is 22497721. The reversal of 22497720 is 2779422.

It is an interprime number because it is at equal distance from previous prime (22497719) and next prime (22497721).

It is a super-2 number, since 2×22497720² = 1012294810396800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22497721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12552 + ... + 14231.

It is an arithmetic number, because the mean of its divisors is an integer number (1205280).

Almost surely, 2^22497720 is an apocalyptic number.

22497720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22497720 is an abundant number, since it is smaller than the sum of its proper divisors (54640200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22497720 is a wasteful number, since it uses less digits than its factorization.

22497720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26804 (or 26800 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 22497720 is about 4743.1761510616. The cubic root of 22497720 is about 282.3012725104.

The spelling of 22497720 in words is "twenty-two million, four hundred ninety-seven thousand, seven hundred twenty".