20011969157 has 2 divisors, whose sum is σ = 20011969158. Its totient is φ = 20011969156.

The previous prime is 20011969151. The next prime is 20011969193. The reversal of 20011969157 is 75196911002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19615122916 + 396846241 = 140054^2 + 19921^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011969157 - 2¹⁶ = 20011903621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20011969151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005984578 + 10005984579.

It is an arithmetic number, because the mean of its divisors is an integer number (10005984579).

Almost surely, 2^20011969157 is an apocalyptic number.

It is an amenable number.

20011969157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011969157 is an equidigital number, since it uses as much as digits as its factorization.

20011969157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 41.

The spelling of 20011969157 in words is "twenty billion, eleven million, nine hundred sixty-nine thousand, one hundred fifty-seven".