22501690 has 16 divisors (see below), whose sum is σ = 40863528. Its totient is φ = 8920576.

The previous prime is 22501679. The next prime is 22501697. The reversal of 22501690 is 9610522.

It can be written as a sum of positive squares in 4 ways, for example, as 4498641 + 18003049 = 2121^2 + 4243^2 .

It is a super-2 number, since 2×22501690² = 1012652105712200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22501697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8827 + ... + 11086.

Almost surely, 2^22501690 is an apocalyptic number.

22501690 is a deficient number, since it is larger than the sum of its proper divisors (18361838).

22501690 is a wasteful number, since it uses less digits than its factorization.

22501690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20033.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 22501690 is about 4743.5946285491. The cubic root of 22501690 is about 282.3178767135.

It can be divided in two parts, 2250 and 1690, that multiplied together give a square (3802500 = 1950²).

The spelling of 22501690 in words is "twenty-two million, five hundred one thousand, six hundred ninety".