20234157997 has 2 divisors, whose sum is σ = 20234157998. Its totient is φ = 20234157996.

The previous prime is 20234157989. The next prime is 20234158001. The reversal of 20234157997 is 79975143202.

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., 17943674116 + 2290483881 = 133954^2 + 47859^2 .

It is a cyclic number.

It is not a de Polignac number, because 20234157997 - 2³ = 20234157989 is a prime.

It is a super-2 number, since 2×20234157997² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20234157997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20234157397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10117078998 + 10117078999.

It is an arithmetic number, because the mean of its divisors is an integer number (10117078999).

Almost surely, 2^20234157997 is an apocalyptic number.

It is an amenable number.

20234157997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20234157997 is an equidigital number, since it uses as much as digits as its factorization.

20234157997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 952560, while the sum is 49.

The spelling of 20234157997 in words is "twenty billion, two hundred thirty-four million, one hundred fifty-seven thousand, nine hundred ninety-seven".