20403740477 has 2 divisors, whose sum is σ = 20403740478. Its totient is φ = 20403740476.

The previous prime is 20403740449. The next prime is 20403740503. The reversal of 20403740477 is 77404730402.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13108189081 + 7295551396 = 114491^2 + 85414^2 .

It is a cyclic number.

It is not a de Polignac number, because 20403740477 - 2¹⁴ = 20403724093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20403740477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20403740417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201870238 + 10201870239.

It is an arithmetic number, because the mean of its divisors is an integer number (10201870239).

Almost surely, 2^20403740477 is an apocalyptic number.

It is an amenable number.

20403740477 is a deficient number, since it is larger than the sum of its proper divisors (1).

20403740477 is an equidigital number, since it uses as much as digits as its factorization.

20403740477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 131712, while the sum is 38.

The spelling of 20403740477 in words is "twenty billion, four hundred three million, seven hundred forty thousand, four hundred seventy-seven".