20423444 has 12 divisors (see below), whose sum is σ = 36415764. Its totient is φ = 10018944.

The previous prime is 20423441. The next prime is 20423449. The reversal of 20423444 is 44432402.

It can be written as a sum of positive squares in 2 ways, for example, as 11303044 + 9120400 = 3362^2 + 3020^2 .

It is a super-3 number, since 3×20423444³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47957 + ... + 48380.

It is an arithmetic number, because the mean of its divisors is an integer number (3034647).

Almost surely, 2^20423444 is an apocalyptic number.

It is an amenable number.

20423444 is a deficient number, since it is larger than the sum of its proper divisors (15992320).

20423444 is a wasteful number, since it uses less digits than its factorization.

20423444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96394 (or 96392 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 23.

The square root of 20423444 is about 4519.2304654664. The cubic root of 20423444 is about 273.3440718896.

Adding to 20423444 its reverse (44432402), we get a palindrome (64855846).

The spelling of 20423444 in words is "twenty million, four hundred twenty-three thousand, four hundred forty-four".