20146993877 has 2 divisors, whose sum is σ = 20146993878. Its totient is φ = 20146993876.

The previous prime is 20146993871. The next prime is 20146993903. The reversal of 20146993877 is 77839964102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14913050161 + 5233943716 = 122119^2 + 72346^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20146993877 is a prime.

It is a super-2 number, since 2×20146993877² (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 (20146993871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10073496938 + 10073496939.

It is an arithmetic number, because the mean of its divisors is an integer number (10073496939).

Almost surely, 2^20146993877 is an apocalyptic number.

It is an amenable number.

20146993877 is a deficient number, since it is larger than the sum of its proper divisors (1).

20146993877 is an equidigital number, since it uses as much as digits as its factorization.

20146993877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4572288, while the sum is 56.

The spelling of 20146993877 in words is "twenty billion, one hundred forty-six million, nine hundred ninety-three thousand, eight hundred seventy-seven".