20196440 has 64 divisors (see below), whose sum is σ = 50038560. Its totient is φ = 7275520.

The previous prime is 20196439. The next prime is 20196443. The reversal of 20196440 is 4469102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20196443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86564 + ... + 86796.

Almost surely, 2^20196440 is an apocalyptic number.

20196440 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 20196440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25019280).

20196440 is an abundant number, since it is smaller than the sum of its proper divisors (29842120).

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

20196440 is a wasteful number, since it uses less digits than its factorization.

20196440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452 (or 448 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20196440 is about 4494.0449485959. The cubic root of 20196440 is about 272.3275681558.

The spelling of 20196440 in words is "twenty million, one hundred ninety-six thousand, four hundred forty".