20497082240 has 96 divisors (see below), whose sum is σ = 52053262200. Its totient is φ = 7716478976.

The previous prime is 20497082237. The next prime is 20497082279. The reversal of 20497082240 is 4228079402.

It is a junction number, because it is equal to n+sod(n) for n = 20497082194 and 20497082203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129551 + ... + 240369.

Almost surely, 2^20497082240 is an apocalyptic number.

20497082240 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 20497082240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26026631100).

20497082240 is an abundant number, since it is smaller than the sum of its proper divisors (31556179960).

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

20497082240 is a wasteful number, since it uses less digits than its factorization.

20497082240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110872 (or 110843 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 38.

The spelling of 20497082240 in words is "twenty billion, four hundred ninety-seven million, eighty-two thousand, two hundred forty".