22642731 has 6 divisors (see below), whose sum is σ = 32706180. Its totient is φ = 15095148.

The previous prime is 22642729. The next prime is 22642831. The reversal of 22642731 is 13724622.

It is not a de Polignac number, because 22642731 - 2¹ = 22642729 is a prime.

It is a super-2 number, since 2×22642731² = 1025386534276722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22642695 and 22642704.

It is not an unprimeable number, because it can be changed into a prime (22642331) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1257921 + ... + 1257938.

It is an arithmetic number, because the mean of its divisors is an integer number (5451030).

Almost surely, 2^22642731 is an apocalyptic number.

22642731 is a deficient number, since it is larger than the sum of its proper divisors (10063449).

22642731 is a wasteful number, since it uses less digits than its factorization.

22642731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2515865 (or 2515862 counting only the distinct ones).

The product of its digits is 4032, while the sum is 27.

The square root of 22642731 is about 4758.4378739246. The cubic root of 22642731 is about 282.9065064269.

The spelling of 22642731 in words is "twenty-two million, six hundred forty-two thousand, seven hundred thirty-one".