20215630117 has 2 divisors, whose sum is σ = 20215630118. Its totient is φ = 20215630116.

The previous prime is 20215630081. The next prime is 20215630129. The reversal of 20215630117 is 71103651202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13837052161 + 6378577956 = 117631^2 + 79866^2 .

It is a cyclic number.

It is not a de Polignac number, because 20215630117 - 2²⁷ = 20081412389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20215630217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10107815058 + 10107815059.

It is an arithmetic number, because the mean of its divisors is an integer number (10107815059).

Almost surely, 2^20215630117 is an apocalyptic number.

It is an amenable number.

20215630117 is a deficient number, since it is larger than the sum of its proper divisors (1).

20215630117 is an equidigital number, since it uses as much as digits as its factorization.

20215630117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 28.

The spelling of 20215630117 in words is "twenty billion, two hundred fifteen million, six hundred thirty thousand, one hundred seventeen".