20950311 has 4 divisors (see below), whose sum is σ = 27933752. Its totient is φ = 13966872.

The previous prime is 20950289. The next prime is 20950337. The reversal of 20950311 is 11305902.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-20950311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20950411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3491716 + ... + 3491721.

It is an arithmetic number, because the mean of its divisors is an integer number (6983438).

Almost surely, 2^20950311 is an apocalyptic number.

20950311 is a deficient number, since it is larger than the sum of its proper divisors (6983441).

20950311 is an equidigital number, since it uses as much as digits as its factorization.

20950311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6983440.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 20950311 is about 4577.1509697627. The cubic root of 20950311 is about 275.6746454966.

The spelling of 20950311 in words is "twenty million, nine hundred fifty thousand, three hundred eleven".