20807020799 has 2 divisors, whose sum is σ = 20807020800. Its totient is φ = 20807020798.

The previous prime is 20807020769. The next prime is 20807020823. The reversal of 20807020799 is 99702070802.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20807020799 is a prime.

It is a super-2 number, since 2×20807020799² (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 (20807020709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10403510399 + 10403510400.

It is an arithmetic number, because the mean of its divisors is an integer number (10403510400).

Almost surely, 2^20807020799 is an apocalyptic number.

20807020799 is a deficient number, since it is larger than the sum of its proper divisors (1).

20807020799 is an equidigital number, since it uses as much as digits as its factorization.

20807020799 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 44.

The spelling of 20807020799 in words is "twenty billion, eight hundred seven million, twenty thousand, seven hundred ninety-nine".