20628139799 has 2 divisors, whose sum is σ = 20628139800. Its totient is φ = 20628139798.

The previous prime is 20628139769. The next prime is 20628139823. The reversal of 20628139799 is 99793182602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20628139799 - 2²⁰ = 20627091223 is a prime.

It is a super-3 number, since 3×20628139799³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20628139769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10314069899 + 10314069900.

It is an arithmetic number, because the mean of its divisors is an integer number (10314069900).

Almost surely, 2^20628139799 is an apocalyptic number.

20628139799 is a deficient number, since it is larger than the sum of its proper divisors (1).

20628139799 is an equidigital number, since it uses as much as digits as its factorization.

20628139799 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2939328, while the sum is 56.

The spelling of 20628139799 in words is "twenty billion, six hundred twenty-eight million, one hundred thirty-nine thousand, seven hundred ninety-nine".