20243904 has 28 divisors (see below), whose sum is σ = 53562504. Its totient is φ = 6747904.

The previous prime is 20243891. The next prime is 20243939. The reversal of 20243904 is 40934202.

It is a happy number.

It is a super-2 number, since 2×20243904² = 819631298322432, 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 an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52527 + ... + 52910.

Almost surely, 2^20243904 is an apocalyptic number.

20243904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20243904 is an abundant number, since it is smaller than the sum of its proper divisors (33318600).

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

20243904 is a wasteful number, since it uses less digits than its factorization.

20243904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105452 (or 105442 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 20243904 is about 4499.3226156834. The cubic root of 20243904 is about 272.5407351498.

The spelling of 20243904 in words is "twenty million, two hundred forty-three thousand, nine hundred four".