20423310 has 32 divisors (see below), whose sum is σ = 51148800. Its totient is φ = 5209248.

The previous prime is 20423257. The next prime is 20423329. The reversal of 20423310 is 1332402.

It is a super-2 number, since 2×20423310² = 834223182712200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20423310.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14110 + ... + 15489.

It is an arithmetic number, because the mean of its divisors is an integer number (1598400).

Almost surely, 2^20423310 is an apocalyptic number.

20423310 is an abundant number, since it is smaller than the sum of its proper divisors (30725490).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20423310 is a wasteful number, since it uses less digits than its factorization.

20423310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29632.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 20423310 is about 4519.2156399092. The cubic root of 20423310 is about 273.3434740768.

Adding to 20423310 its reverse (1332402), we get a palindrome (21755712).

The spelling of 20423310 in words is "twenty million, four hundred twenty-three thousand, three hundred ten".