20623139 has 2 divisors, whose sum is σ = 20623140. Its totient is φ = 20623138.

The previous prime is 20623133. The next prime is 20623181. The reversal of 20623139 is 93132602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20623139 - 2¹² = 20619043 is a prime.

It is not a weakly prime, because it can be changed into another prime (20623133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10311569 + 10311570.

It is an arithmetic number, because the mean of its divisors is an integer number (10311570).

Almost surely, 2^20623139 is an apocalyptic number.

20623139 is a deficient number, since it is larger than the sum of its proper divisors (1).

20623139 is an equidigital number, since it uses as much as digits as its factorization.

20623139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 20623139 is about 4541.2706371675. The cubic root of 20623139 is about 274.2320791109.

The spelling of 20623139 in words is "twenty million, six hundred twenty-three thousand, one hundred thirty-nine".