20146993871 has 2 divisors, whose sum is σ = 20146993872. Its totient is φ = 20146993870.

The previous prime is 20146993859. The next prime is 20146993877. The reversal of 20146993871 is 17839964102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20146993871 - 2¹⁰ = 20146992847 is a prime.

It is a super-2 number, since 2×20146993871² (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 (20146993877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10073496935 + 10073496936.

It is an arithmetic number, because the mean of its divisors is an integer number (10073496936).

Almost surely, 2^20146993871 is an apocalyptic number.

20146993871 is a deficient number, since it is larger than the sum of its proper divisors (1).

20146993871 is an equidigital number, since it uses as much as digits as its factorization.

20146993871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 50.

The spelling of 20146993871 in words is "twenty billion, one hundred forty-six million, nine hundred ninety-three thousand, eight hundred seventy-one".