20870423 has 12 divisors (see below), whose sum is σ = 24533712. Its totient is φ = 17700480.

The previous prime is 20870389. The next prime is 20870429. The reversal of 20870423 is 32407802.

It is a de Polignac number, because none of the positive numbers 2^k-20870423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20870392 and 20870401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20870429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2558 + ... + 6948.

It is an arithmetic number, because the mean of its divisors is an integer number (2044476).

Almost surely, 2^20870423 is an apocalyptic number.

20870423 is a deficient number, since it is larger than the sum of its proper divisors (3663289).

20870423 is an equidigital number, since it uses as much as digits as its factorization.

20870423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4502 (or 4495 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 20870423 is about 4568.4158085708. The cubic root of 20870423 is about 275.3237971098.

The spelling of 20870423 in words is "twenty million, eight hundred seventy thousand, four hundred twenty-three".