20146814081 has 2 divisors, whose sum is σ = 20146814082. Its totient is φ = 20146814080.

The previous prime is 20146813877. The next prime is 20146814117. The reversal of 20146814081 is 18041864102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13043695681 + 7103118400 = 114209^2 + 84280^2 .

It is a cyclic number.

It is not a de Polignac number, because 20146814081 - 2³⁰ = 19073072257 is a prime.

It is a super-2 number, since 2×20146814081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20146817081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10073407040 + 10073407041.

It is an arithmetic number, because the mean of its divisors is an integer number (10073407041).

Almost surely, 2^20146814081 is an apocalyptic number.

It is an amenable number.

20146814081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20146814081 is an equidigital number, since it uses as much as digits as its factorization.

20146814081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12288, while the sum is 35.

The spelling of 20146814081 in words is "twenty billion, one hundred forty-six million, eight hundred fourteen thousand, eighty-one".