20010123157 has 2 divisors, whose sum is σ = 20010123158. Its totient is φ = 20010123156.

The previous prime is 20010123109. The next prime is 20010123187. The reversal of 20010123157 is 75132101002.

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., 15902723236 + 4107399921 = 126106^2 + 64089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20010123157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20010123187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005061578 + 10005061579.

It is an arithmetic number, because the mean of its divisors is an integer number (10005061579).

Almost surely, 2^20010123157 is an apocalyptic number.

It is an amenable number.

20010123157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20010123157 is an equidigital number, since it uses as much as digits as its factorization.

20010123157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 420, while the sum is 22.

Adding to 20010123157 its reverse (75132101002), we get a palindrome (95142224159).

The spelling of 20010123157 in words is "twenty billion, ten million, one hundred twenty-three thousand, one hundred fifty-seven".