20247504 has 40 divisors (see below), whose sum is σ = 52704960. Its totient is φ = 6697728.

The previous prime is 20247457. The next prime is 20247509. The reversal of 20247504 is 40574202.

It is a super-2 number, since 2×20247504² = 819922836460032, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20247509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5037 + ... + 8115.

It is an arithmetic number, because the mean of its divisors is an integer number (1317624).

Almost surely, 2^20247504 is an apocalyptic number.

20247504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20247504 is an abundant number, since it is smaller than the sum of its proper divisors (32457456).

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

20247504 is a wasteful number, since it uses less digits than its factorization.

20247504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3227 (or 3221 counting only the distinct ones).

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

The square root of 20247504 is about 4499.7226581202. The cubic root of 20247504 is about 272.5568896178.

The spelling of 20247504 in words is "twenty million, two hundred forty-seven thousand, five hundred four".