22120731 has 12 divisors (see below), whose sum is σ = 33634120. Its totient is φ = 13970880.

The previous prime is 22120729. The next prime is 22120739. The reversal of 22120731 is 13702122.

It is not a de Polignac number, because 22120731 - 2¹ = 22120729 is a prime.

It is a super-2 number, since 2×22120731² = 978653479948722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22120739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64510 + ... + 64851.

Almost surely, 2^22120731 is an apocalyptic number.

22120731 is a deficient number, since it is larger than the sum of its proper divisors (11513389).

22120731 is a wasteful number, since it uses less digits than its factorization.

22120731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129386 (or 129383 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 22120731 is about 4703.2681190849. The cubic root of 22120731 is about 280.7155634673.

Adding to 22120731 its reverse (13702122), we get a palindrome (35822853).

The spelling of 22120731 in words is "twenty-two million, one hundred twenty thousand, seven hundred thirty-one".