20475457399 has 2 divisors, whose sum is σ = 20475457400. Its totient is φ = 20475457398.

The previous prime is 20475457393. The next prime is 20475457421. The reversal of 20475457399 is 99375457402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20475457399 - 2⁵ = 20475457367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20475457393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10237728699 + 10237728700.

It is an arithmetic number, because the mean of its divisors is an integer number (10237728700).

Almost surely, 2^20475457399 is an apocalyptic number.

20475457399 is a deficient number, since it is larger than the sum of its proper divisors (1).

20475457399 is an equidigital number, since it uses as much as digits as its factorization.

20475457399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9525600, while the sum is 55.

The spelling of 20475457399 in words is "twenty billion, four hundred seventy-five million, four hundred fifty-seven thousand, three hundred ninety-nine".