20475457403 has 4 divisors (see below), whose sum is σ = 20476860600. Its totient is φ = 20474054208.

The previous prime is 20475457399. The next prime is 20475457421. The reversal of 20475457403 is 30475457402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20475457403 - 2² = 20475457399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20475457423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 679478 + ... + 708971.

It is an arithmetic number, because the mean of its divisors is an integer number (5119215150).

Almost surely, 2^20475457403 is an apocalyptic number.

20475457403 is a deficient number, since it is larger than the sum of its proper divisors (1403197).

20475457403 is a wasteful number, since it uses less digits than its factorization.

20475457403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1403196.

The product of its (nonzero) digits is 470400, while the sum is 41.

Subtracting 20475457403 from its reverse (30475457402), we obtain a palindrome (9999999999).

The spelling of 20475457403 in words is "twenty billion, four hundred seventy-five million, four hundred fifty-seven thousand, four hundred three".