20026561157 has 2 divisors, whose sum is σ = 20026561158. Its totient is φ = 20026561156.

The previous prime is 20026561147. The next prime is 20026561169. The reversal of 20026561157 is 75116562002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17066548321 + 2960012836 = 130639^2 + 54406^2 .

It is a cyclic number.

It is not a de Polignac number, because 20026561157 - 2²⁰ = 20025512581 is a prime.

It is a super-2 number, since 2×20026561157² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20026561147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10013280578 + 10013280579.

It is an arithmetic number, because the mean of its divisors is an integer number (10013280579).

Almost surely, 2^20026561157 is an apocalyptic number.

It is an amenable number.

20026561157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20026561157 is an equidigital number, since it uses as much as digits as its factorization.

20026561157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 35.

The spelling of 20026561157 in words is "twenty billion, twenty-six million, five hundred sixty-one thousand, one hundred fifty-seven".