20423031 has 16 divisors (see below), whose sum is σ = 27696768. Its totient is φ = 13384800.

The previous prime is 20423023. The next prime is 20423041. The reversal of 20423031 is 13032402.

It is not a de Polignac number, because 20423031 - 2³ = 20423023 is a prime.

It is a super-2 number, since 2×20423031² = 834200390453922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20423031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423041) 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, 61536 + ... + 61866.

It is an arithmetic number, because the mean of its divisors is an integer number (1731048).

Almost surely, 2^20423031 is an apocalyptic number.

20423031 is a deficient number, since it is larger than the sum of its proper divisors (7273737).

20423031 is a wasteful number, since it uses less digits than its factorization.

20423031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622.

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

The square root of 20423031 is about 4519.1847716153. The cubic root of 20423031 is about 273.3422293687.

Adding to 20423031 its reverse (13032402), we get a palindrome (33455433).

The spelling of 20423031 in words is "twenty million, four hundred twenty-three thousand, thirty-one".