20195880 has 128 divisors (see below), whose sum is σ = 64281600. Its totient is φ = 5068800.

The previous prime is 20195873. The next prime is 20195887. The reversal of 20195880 is 8859102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20195873) and next prime (20195887).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20195887) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 226876 + ... + 226964.

It is an arithmetic number, because the mean of its divisors is an integer number (502200).

Almost surely, 2^20195880 is an apocalyptic number.

20195880 is a gapful number since it is divisible by the number (20) 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 20195880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32140800).

20195880 is an abundant number, since it is smaller than the sum of its proper divisors (44085720).

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

20195880 is a wasteful number, since it uses less digits than its factorization.

20195880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 20195880 is about 4493.9826434912. The cubic root of 20195880 is about 272.3250511306.

The spelling of 20195880 in words is "twenty million, one hundred ninety-five thousand, eight hundred eighty".