20604708977 has 2 divisors, whose sum is σ = 20604708978. Its totient is φ = 20604708976.

The previous prime is 20604708967. The next prime is 20604709007. The reversal of 20604708977 is 77980740602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15246322576 + 5358386401 = 123476^2 + 73201^2 .

It is a cyclic number.

It is not a de Polignac number, because 20604708977 - 2¹⁰ = 20604707953 is a prime.

It is not a weakly prime, because it can be changed into another prime (20604708937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10302354488 + 10302354489.

It is an arithmetic number, because the mean of its divisors is an integer number (10302354489).

Almost surely, 2^20604708977 is an apocalyptic number.

It is an amenable number.

20604708977 is a deficient number, since it is larger than the sum of its proper divisors (1).

20604708977 is an equidigital number, since it uses as much as digits as its factorization.

20604708977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1185408, while the sum is 50.

The spelling of 20604708977 in words is "twenty billion, six hundred four million, seven hundred eight thousand, nine hundred seventy-seven".