20390272 has 48 divisors (see below), whose sum is σ = 47267820. Its totient is φ = 8736000.

The previous prime is 20390269. The next prime is 20390291. The reversal of 20390272 is 27209302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4647 + ... + 7897.

Almost surely, 2^20390272 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 20390272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23633910).

20390272 is an abundant number, since it is smaller than the sum of its proper divisors (26877548).

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

20390272 is an equidigital number, since it uses as much as digits as its factorization.

20390272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3279 (or 3260 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 20390272 is about 4515.5588801388. The cubic root of 20390272 is about 273.1960021338.

Adding to 20390272 its reverse (27209302), we get a palindrome (47599574).

The spelling of 20390272 in words is "twenty million, three hundred ninety thousand, two hundred seventy-two".