20289626 has 12 divisors (see below), whose sum is σ = 35403498. Its totient is φ = 8695512.

The previous prime is 20289623. The next prime is 20289631. The reversal of 20289626 is 62698202.

It can be written as a sum of positive squares in only one way, i.e., 20259001 + 30625 = 4501^2 + 175^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (20289623) 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, 103421 + ... + 103616.

Almost surely, 2^20289626 is an apocalyptic number.

20289626 is a deficient number, since it is larger than the sum of its proper divisors (15113872).

20289626 is a wasteful number, since it uses less digits than its factorization.

20289626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207053 (or 207046 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 20289626 is about 4504.4007370570. The cubic root of 20289626 is about 272.7457637496.

The spelling of 20289626 in words is "twenty million, two hundred eighty-nine thousand, six hundred twenty-six".