20402372251 has 2 divisors, whose sum is σ = 20402372252. Its totient is φ = 20402372250.

The previous prime is 20402372227. The next prime is 20402372257. The reversal of 20402372251 is 15227320402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20402372251 - 2²⁹ = 19865501339 is a prime.

It is not a weakly prime, because it can be changed into another prime (20402372257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201186125 + 10201186126.

It is an arithmetic number, because the mean of its divisors is an integer number (10201186126).

Almost surely, 2^20402372251 is an apocalyptic number.

20402372251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20402372251 is an equidigital number, since it uses as much as digits as its factorization.

20402372251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 28.

Adding to 20402372251 its reverse (15227320402), we get a palindrome (35629692653).

The spelling of 20402372251 in words is "twenty billion, four hundred two million, three hundred seventy-two thousand, two hundred fifty-one".