20427504 has 40 divisors (see below), whose sum is σ = 53448960. Its totient is φ = 6721728.

The previous prime is 20427499. The next prime is 20427529. The reversal of 20427504 is 40572402.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1099 + ... + 6485.

It is an arithmetic number, because the mean of its divisors is an integer number (1336224).

Almost surely, 2^20427504 is an apocalyptic number.

20427504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20427504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26724480).

20427504 is an abundant number, since it is smaller than the sum of its proper divisors (33021456).

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

20427504 is a wasteful number, since it uses less digits than its factorization.

20427504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5477 (or 5471 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 24.

The square root of 20427504 is about 4519.6796346644. The cubic root of 20427504 is about 273.3621834840.

Adding to 20427504 its reverse (40572402), we get a palindrome (60999906).

The spelling of 20427504 in words is "twenty million, four hundred twenty-seven thousand, five hundred four".