22072731 has 4 divisors (see below), whose sum is σ = 29430312. Its totient is φ = 14715152.

The previous prime is 22072723. The next prime is 22072733. The reversal of 22072731 is 13727022.

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

It is a cyclic number.

It is not a de Polignac number, because 22072731 - 2³ = 22072723 is a prime.

It is a super-2 number, since 2×22072731² = 974410907596722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22072733) 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 3 ways as a sum of consecutive naturals, for example, 3678786 + ... + 3678791.

It is an arithmetic number, because the mean of its divisors is an integer number (7357578).

Almost surely, 2^22072731 is an apocalyptic number.

22072731 is a deficient number, since it is larger than the sum of its proper divisors (7357581).

22072731 is an equidigital number, since it uses as much as digits as its factorization.

22072731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7357580.

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 22072731 is about 4698.1625131534. The cubic root of 22072731 is about 280.5123739064.

Adding to 22072731 its reverse (13727022), we get a palindrome (35799753).

The spelling of 22072731 in words is "twenty-two million, seventy-two thousand, seven hundred thirty-one".