20216951 has 2 divisors, whose sum is σ = 20216952. Its totient is φ = 20216950.

The previous prime is 20216947. The next prime is 20216981. The reversal of 20216951 is 15961202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20216951 - 2² = 20216947 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20216951.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20216921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10108475 + 10108476.

It is an arithmetic number, because the mean of its divisors is an integer number (10108476).

Almost surely, 2^20216951 is an apocalyptic number.

20216951 is a deficient number, since it is larger than the sum of its proper divisors (1).

20216951 is an equidigital number, since it uses as much as digits as its factorization.

20216951 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 20216951 is about 4496.3263893983. The cubic root of 20216951 is about 272.4197266569.

The spelling of 20216951 in words is "twenty million, two hundred sixteen thousand, nine hundred fifty-one".