20195904 has 56 divisors (see below), whose sum is σ = 53766720. Its totient is φ = 6690304.

The previous prime is 20195893. The next prime is 20195933. The reversal of 20195904 is 40959102.

It is a happy number.

It is a super-3 number, since 3×20195904³ (a number of 23 digits) contains 333 as substring.

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, 56077 + ... + 56435.

It is an arithmetic number, because the mean of its divisors is an integer number (960120).

Almost surely, 2^20195904 is an apocalyptic number.

20195904 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 20195904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26883360).

20195904 is an abundant number, since it is smaller than the sum of its proper divisors (33570816).

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

20195904 is a wasteful number, since it uses less digits than its factorization.

20195904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667 (or 657 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 20195904 is about 4493.9853137277. The cubic root of 20195904 is about 272.3251590040.

The spelling of 20195904 in words is "twenty million, one hundred ninety-five thousand, nine hundred four".