20534904 has 128 divisors (see below), whose sum is σ = 62899200. Its totient is φ = 6168960.

The previous prime is 20534893. The next prime is 20534933. The reversal of 20534904 is 40943502.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 199317 + ... + 199419.

It is an arithmetic number, because the mean of its divisors is an integer number (491400).

Almost surely, 2^20534904 is an apocalyptic number.

20534904 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 20534904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31449600).

20534904 is an abundant number, since it is smaller than the sum of its proper divisors (42364296).

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

20534904 is a wasteful number, since it uses less digits than its factorization.

20534904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202 (or 192 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20534904 is about 4531.5454317484. The cubic root of 20534904 is about 273.8404242470.

The spelling of 20534904 in words is "twenty million, five hundred thirty-four thousand, nine hundred four".