20620104409 has 2 divisors, whose sum is σ = 20620104410. Its totient is φ = 20620104408.

The previous prime is 20620104383. The next prime is 20620104431. The reversal of 20620104409 is 90440102602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19309881600 + 1310222809 = 138960^2 + 36197^2 .

It is a cyclic number.

It is not a de Polignac number, because 20620104409 - 2⁵ = 20620104377 is a prime.

It is a super-2 number, since 2×20620104409² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20620104709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10310052204 + 10310052205.

It is an arithmetic number, because the mean of its divisors is an integer number (10310052205).

Almost surely, 2^20620104409 is an apocalyptic number.

It is an amenable number.

20620104409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20620104409 is an equidigital number, since it uses as much as digits as its factorization.

20620104409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The spelling of 20620104409 in words is "twenty billion, six hundred twenty million, one hundred four thousand, four hundred nine".