20423472 has 20 divisors (see below), whose sum is σ = 52760760. Its totient is φ = 6807808.

The previous prime is 20423449. The next prime is 20423479. The reversal of 20423472 is 27432402.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (20423479) 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, 212697 + ... + 212792.

It is an arithmetic number, because the mean of its divisors is an integer number (2638038).

Almost surely, 2^20423472 is an apocalyptic number.

It is an amenable number.

20423472 is an abundant number, since it is smaller than the sum of its proper divisors (32337288).

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

20423472 is a wasteful number, since it uses less digits than its factorization.

20423472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425500 (or 425494 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 24.

The square root of 20423472 is about 4519.2335633379. The cubic root of 20423472 is about 273.3441968053.

Adding to 20423472 its reverse (27432402), we get a palindrome (47855874).

The spelling of 20423472 in words is "twenty million, four hundred twenty-three thousand, four hundred seventy-two".