20461657240 has 64 divisors (see below), whose sum is σ = 46585899360. Its totient is φ = 8087654400.

The previous prime is 20461657207. The next prime is 20461657243. The reversal of 20461657240 is 4275616402.

It is a self number, because there is not a number n which added to its sum of digits gives 20461657240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20461657243) 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, 2716119 + ... + 2723641.

Almost surely, 2^20461657240 is an apocalyptic number.

20461657240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20461657240 is an abundant number, since it is smaller than the sum of its proper divisors (26124242120).

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

20461657240 is a wasteful number, since it uses less digits than its factorization.

20461657240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8332 (or 8328 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 37.

The spelling of 20461657240 in words is "twenty billion, four hundred sixty-one million, six hundred fifty-seven thousand, two hundred forty".