20908623 has 32 divisors (see below), whose sum is σ = 31138560. Its totient is φ = 12418560.

The previous prime is 20908609. The next prime is 20908627. The reversal of 20908623 is 32680902.

It is not a de Polignac number, because 20908623 - 2¹⁶ = 20843087 is a prime.

It is a super-2 number, since 2×20908623² = 874341031512258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20908627) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98988 + ... + 99198.

It is an arithmetic number, because the mean of its divisors is an integer number (973080).

Almost surely, 2^20908623 is an apocalyptic number.

20908623 is a deficient number, since it is larger than the sum of its proper divisors (10229937).

20908623 is a wasteful number, since it uses less digits than its factorization.

20908623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 20908623 is about 4572.5947775853. The cubic root of 20908623 is about 275.4916735790.

The spelling of 20908623 in words is "twenty million, nine hundred eight thousand, six hundred twenty-three".