20451701823 has 16 divisors (see below), whose sum is σ = 31209620736. Its totient is φ = 11669765760.

The previous prime is 20451701773. The next prime is 20451701857. The reversal of 20451701823 is 32810715402.

It is not a de Polignac number, because 20451701823 - 2⁶ = 20451701759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20451701423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 690186 + ... + 719207.

It is an arithmetic number, because the mean of its divisors is an integer number (1950601296).

Almost surely, 2^20451701823 is an apocalyptic number.

20451701823 is a deficient number, since it is larger than the sum of its proper divisors (10757918913).

20451701823 is a wasteful number, since it uses less digits than its factorization.

20451701823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410094.

The product of its (nonzero) digits is 13440, while the sum is 33.

The spelling of 20451701823 in words is "twenty billion, four hundred fifty-one million, seven hundred one thousand, eight hundred twenty-three".