20874208477 has 2 divisors, whose sum is σ = 20874208478. Its totient is φ = 20874208476.

The previous prime is 20874208471. The next prime is 20874208529. The reversal of 20874208477 is 77480247802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15993649156 + 4880559321 = 126466^2 + 69861^2 .

It is a cyclic number.

It is not a de Polignac number, because 20874208477 - 2⁷ = 20874208349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20874208477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20874208471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10437104238 + 10437104239.

It is an arithmetic number, because the mean of its divisors is an integer number (10437104239).

Almost surely, 2^20874208477 is an apocalyptic number.

It is an amenable number.

20874208477 is a deficient number, since it is larger than the sum of its proper divisors (1).

20874208477 is an equidigital number, since it uses as much as digits as its factorization.

20874208477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1404928, while the sum is 49.

The spelling of 20874208477 in words is "twenty billion, eight hundred seventy-four million, two hundred eight thousand, four hundred seventy-seven".