20426172 has 48 divisors (see below), whose sum is σ = 51781632. Its totient is φ = 6229440.

The previous prime is 20426167. The next prime is 20426173. The reversal of 20426172 is 27162402.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20426173) 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, 19297 + ... + 20327.

It is an arithmetic number, because the mean of its divisors is an integer number (1078784).

Almost surely, 2^20426172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20426172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25890816).

20426172 is an abundant number, since it is smaller than the sum of its proper divisors (31355460).

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

20426172 is a wasteful number, since it uses less digits than its factorization.

20426172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178 (or 1176 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 20426172 is about 4519.5322766853. The cubic root of 20426172 is about 273.3562417180.

Adding to 20426172 its reverse (27162402), we get a palindrome (47588574).

The spelling of 20426172 in words is "twenty million, four hundred twenty-six thousand, one hundred seventy-two".