20197512 has 80 divisors (see below), whose sum is σ = 57499200. Its totient is φ = 6622560.

The previous prime is 20197511. The next prime is 20197531. The reversal of 20197512 is 21579102.

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

It is not an unprimeable number, because it can be changed into a prime (20197511) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 45789 + ... + 46227.

It is an arithmetic number, because the mean of its divisors is an integer number (718740).

Almost surely, 2^20197512 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 20197512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28749600).

20197512 is an abundant number, since it is smaller than the sum of its proper divisors (37301688).

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

20197512 is a wasteful number, since it uses less digits than its factorization.

20197512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528 (or 515 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 20197512 is about 4494.1642159583. The cubic root of 20197512 is about 272.3323863315.

The spelling of 20197512 in words is "twenty million, one hundred ninety-seven thousand, five hundred twelve".