20197912 has 64 divisors (see below), whose sum is σ = 46771200. Its totient is φ = 7983360.

The previous prime is 20197909. The next prime is 20197937. The reversal of 20197912 is 21979102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43393 + ... + 43855.

It is an arithmetic number, because the mean of its divisors is an integer number (730800).

Almost surely, 2^20197912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20197912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23385600).

20197912 is an abundant number, since it is smaller than the sum of its proper divisors (26573288).

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

20197912 is a wasteful number, since it uses less digits than its factorization.

20197912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536 (or 532 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 20197912 is about 4494.2087178946. The cubic root of 20197912 is about 272.3341841146.

The spelling of 20197912 in words is "twenty million, one hundred ninety-seven thousand, nine hundred twelve".