20108623 has 2 divisors, whose sum is σ = 20108624. Its totient is φ = 20108622.

The previous prime is 20108609. The next prime is 20108651. The reversal of 20108623 is 32680102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20108623 - 2⁵ = 20108591 is a prime.

It is a super-2 number, since 2×20108623² = 808713437912258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20108594 and 20108603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20168623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10054311 + 10054312.

It is an arithmetic number, because the mean of its divisors is an integer number (10054312).

Almost surely, 2^20108623 is an apocalyptic number.

20108623 is a deficient number, since it is larger than the sum of its proper divisors (1).

20108623 is an equidigital number, since it uses as much as digits as its factorization.

20108623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 20108623 is about 4484.2639306803. The cubic root of 20108623 is about 271.9322883284.

Adding to 20108623 its reverse (32680102), we get a palindrome (52788725).

The spelling of 20108623 in words is "twenty million, one hundred eight thousand, six hundred twenty-three".