20456477 has 2 divisors, whose sum is σ = 20456478. Its totient is φ = 20456476.

The previous prime is 20456473. The next prime is 20456479. The reversal of 20456477 is 77465402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13623481 + 6832996 = 3691^2 + 2614^2 .

It is a cyclic number.

It is not a de Polignac number, because 20456477 - 2² = 20456473 is a prime.

Together with 20456479, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20456473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10228238 + 10228239.

It is an arithmetic number, because the mean of its divisors is an integer number (10228239).

Almost surely, 2^20456477 is an apocalyptic number.

It is an amenable number.

20456477 is a deficient number, since it is larger than the sum of its proper divisors (1).

20456477 is an equidigital number, since it uses as much as digits as its factorization.

20456477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47040, while the sum is 35.

The square root of 20456477 is about 4522.8837040101. The cubic root of 20456477 is about 273.4913619523.

The spelling of 20456477 in words is "twenty million, four hundred fifty-six thousand, four hundred seventy-seven".