20415232 has 36 divisors (see below), whose sum is σ = 43157016. Its totient is φ = 9605120.

The previous prime is 20415221. The next prime is 20415233. The reversal of 20415232 is 23251402.

It is a super-2 number, since 2×20415232² = 833563395227648, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20415233) 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, 2007 + ... + 6697.

It is an arithmetic number, because the mean of its divisors is an integer number (1198806).

Almost surely, 2^20415232 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 20415232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21578508).

20415232 is an abundant number, since it is smaller than the sum of its proper divisors (22741784).

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

20415232 is an equidigital number, since it uses as much as digits as its factorization.

20415232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4724 (or 4710 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 20415232 is about 4518.3218123547. The cubic root of 20415232 is about 273.3074309515.

Adding to 20415232 its reverse (23251402), we get a palindrome (43666634).

The spelling of 20415232 in words is "twenty million, four hundred fifteen thousand, two hundred thirty-two".