20435904 has 84 divisors (see below), whose sum is σ = 62051184. Its totient is φ = 6408192.

The previous prime is 20435903. The next prime is 20435939. The reversal of 20435904 is 40953402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20435903) 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 11 ways as a sum of consecutive naturals, for example, 8749 + ... + 10835.

Almost surely, 2^20435904 is an apocalyptic number.

20435904 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 20435904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31025592).

20435904 is an abundant number, since it is smaller than the sum of its proper divisors (41615280).

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

20435904 is a wasteful number, since it uses less digits than its factorization.

20435904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2122 (or 2109 counting only the distinct ones).

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

The square root of 20435904 is about 4520.6088085567. The cubic root of 20435904 is about 273.3996481308.

The spelling of 20435904 in words is "twenty million, four hundred thirty-five thousand, nine hundred four".