20740939 has 2 divisors, whose sum is σ = 20740940. Its totient is φ = 20740938.

The previous prime is 20740931. The next prime is 20740981. The reversal of 20740939 is 93904702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20740939 - 2³ = 20740931 is a prime.

It is not a weakly prime, because it can be changed into another prime (20740931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10370469 + 10370470.

It is an arithmetic number, because the mean of its divisors is an integer number (10370470).

Almost surely, 2^20740939 is an apocalyptic number.

20740939 is a deficient number, since it is larger than the sum of its proper divisors (1).

20740939 is an equidigital number, since it uses as much as digits as its factorization.

20740939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 20740939 is about 4554.2221070123. Note that the first 3 decimals coincide. The cubic root of 20740939 is about 274.7532287638.

The spelling of 20740939 in words is "twenty million, seven hundred forty thousand, nine hundred thirty-nine".