20020120157 has 2 divisors, whose sum is σ = 20020120158. Its totient is φ = 20020120156.

The previous prime is 20020120147. The next prime is 20020120177. The reversal of 20020120157 is 75102102002.

It is an a-pointer prime, because the next prime (20020120177) can be obtained adding 20020120157 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15692322361 + 4327797796 = 125269^2 + 65786^2 .

It is a cyclic number.

It is not a de Polignac number, because 20020120157 - 2⁸ = 20020119901 is a prime.

It is a super-2 number, since 2×20020120157² (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 (20020120147) 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, 10010060078 + 10010060079.

It is an arithmetic number, because the mean of its divisors is an integer number (10010060079).

Almost surely, 2^20020120157 is an apocalyptic number.

It is an amenable number.

20020120157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20020120157 is an equidigital number, since it uses as much as digits as its factorization.

20020120157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 280, while the sum is 20.

Adding to 20020120157 its reverse (75102102002), we get a palindrome (95122222159).

The spelling of 20020120157 in words is "twenty billion, twenty million, one hundred twenty thousand, one hundred fifty-seven".