20645460403 has 4 divisors (see below), whose sum is σ = 20704616800. Its totient is φ = 20586304008.

The previous prime is 20645460379. The next prime is 20645460427. The reversal of 20645460403 is 30406454602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30406454602 = 2 ⋅15203227301.

It is an interprime number because it is at equal distance from previous prime (20645460379) and next prime (20645460427).

It is a cyclic number.

It is not a de Polignac number, because 20645460403 - 2⁵ = 20645460371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20645460203) 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, 29577675 + ... + 29578372.

It is an arithmetic number, because the mean of its divisors is an integer number (5176154200).

Almost surely, 2^20645460403 is an apocalyptic number.

20645460403 is a deficient number, since it is larger than the sum of its proper divisors (59156397).

20645460403 is an equidigital number, since it uses as much as digits as its factorization.

20645460403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59156396.

The product of its (nonzero) digits is 69120, while the sum is 34.

The spelling of 20645460403 in words is "twenty billion, six hundred forty-five million, four hundred sixty thousand, four hundred three".