20645012423 has 4 divisors (see below), whose sum is σ = 23594299920. Its totient is φ = 17695724928.

The previous prime is 20645012417. The next prime is 20645012429. The reversal of 20645012423 is 32421054602.

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

It is an interprime number because it is at equal distance from previous prime (20645012417) and next prime (20645012429).

It is not a de Polignac number, because 20645012423 - 2⁴ = 20645012407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20645012429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1474643738 + ... + 1474643751.

It is an arithmetic number, because the mean of its divisors is an integer number (5898574980).

Almost surely, 2^20645012423 is an apocalyptic number.

20645012423 is a deficient number, since it is larger than the sum of its proper divisors (2949287497).

20645012423 is an equidigital number, since it uses as much as digits as its factorization.

20645012423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2949287496.

The product of its (nonzero) digits is 11520, while the sum is 29.

The spelling of 20645012423 in words is "twenty billion, six hundred forty-five million, twelve thousand, four hundred twenty-three".