22699981 has 16 divisors (see below), whose sum is σ = 24952320. Its totient is φ = 20563200.

The previous prime is 22699973. The next prime is 22699987. The reversal of 22699981 is 18999622.

It is not a de Polignac number, because 22699981 - 2³ = 22699973 is a prime.

It is a super-2 number, since 2×22699981² = 1030578274800722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22699987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94860 + ... + 95098.

It is an arithmetic number, because the mean of its divisors is an integer number (1559520).

Almost surely, 2^22699981 is an apocalyptic number.

It is an amenable number.

22699981 is a deficient number, since it is larger than the sum of its proper divisors (2252339).

22699981 is a wasteful number, since it uses less digits than its factorization.

22699981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444.

The product of its digits is 139968, while the sum is 46.

The square root of 22699981 is about 4764.4497058947. The cubic root of 22699981 is about 283.1447398550.

The spelling of 22699981 in words is "twenty-two million, six hundred ninety-nine thousand, nine hundred eighty-one".