20404723 has 8 divisors (see below), whose sum is σ = 21058688. Its totient is φ = 19756224.

The previous prime is 20404717. The next prime is 20404729. The reversal of 20404723 is 32740402.

It is an interprime number because it is at equal distance from previous prime (20404717) and next prime (20404729).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20404723 - 2¹⁷ = 20273651 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20404694 and 20404703.

It is not an unprimeable number, because it can be changed into a prime (20404729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7015 + ... + 9487.

It is an arithmetic number, because the mean of its divisors is an integer number (2632336).

Almost surely, 2^20404723 is an apocalyptic number.

20404723 is a deficient number, since it is larger than the sum of its proper divisors (653965).

20404723 is a wasteful number, since it uses less digits than its factorization.

20404723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2733.

The product of its (nonzero) digits is 1344, while the sum is 22.

The square root of 20404723 is about 4517.1587308838. The cubic root of 20404723 is about 273.2605267451.

The spelling of 20404723 in words is "twenty million, four hundred four thousand, seven hundred twenty-three".