20950639 has 2 divisors, whose sum is σ = 20950640. Its totient is φ = 20950638.

The previous prime is 20950603. The next prime is 20950649. The reversal of 20950639 is 93605902.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20950639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20950649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10475319 + 10475320.

It is an arithmetic number, because the mean of its divisors is an integer number (10475320).

Almost surely, 2^20950639 is an apocalyptic number.

20950639 is a deficient number, since it is larger than the sum of its proper divisors (1).

20950639 is an equidigital number, since it uses as much as digits as its factorization.

20950639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 20950639 is about 4577.1867997712. The cubic root of 20950639 is about 275.6760841516.

The spelling of 20950639 in words is "twenty million, nine hundred fifty thousand, six hundred thirty-nine".