20626538 has 16 divisors (see below), whose sum is σ = 33160320. Its totient is φ = 9597456.

The previous prime is 20626537. The next prime is 20626547. The reversal of 20626538 is 83562602.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20626531) 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, 4358 + ... + 7761.

It is an arithmetic number, because the mean of its divisors is an integer number (2072520).

Almost surely, 2^20626538 is an apocalyptic number.

20626538 is a deficient number, since it is larger than the sum of its proper divisors (12533782).

20626538 is a wasteful number, since it uses less digits than its factorization.

20626538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12181.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 20626538 is about 4541.6448562167. The cubic root of 20626538 is about 274.2471441249.

The spelling of 20626538 in words is "twenty million, six hundred twenty-six thousand, five hundred thirty-eight".