20490725320 has 64 divisors (see below), whose sum is σ = 49793310000. Its totient is φ = 7544060928.

The previous prime is 20490725303. The next prime is 20490725329. The reversal of 20490725320 is 2352709402.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 4291036036 + 16199689284 = 65506^2 + 127278^2 .

It is not an unprimeable number, because it can be changed into a prime (20490725329) 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, 125026 + ... + 237934.

Almost surely, 2^20490725320 is an apocalyptic number.

20490725320 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 20490725320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24896655000).

20490725320 is an abundant number, since it is smaller than the sum of its proper divisors (29302584680).

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

20490725320 is a wasteful number, since it uses less digits than its factorization.

20490725320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113282 (or 113278 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The spelling of 20490725320 in words is "twenty billion, four hundred ninety million, seven hundred twenty-five thousand, three hundred twenty".