20641325540 has 96 divisors (see below), whose sum is σ = 50286023424. Its totient is φ = 7033794560.

The previous prime is 20641325539. The next prime is 20641325543. The reversal of 20641325540 is 4552314602.

It is a junction number, because it is equal to n+sod(n) for n = 20641325497 and 20641325506.

It is not an unprimeable number, because it can be changed into a prime (20641325543) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 859577 + ... + 883263.

It is an arithmetic number, because the mean of its divisors is an integer number (523812744).

Almost surely, 2^20641325540 is an apocalyptic number.

20641325540 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 20641325540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25143011712).

20641325540 is an abundant number, since it is smaller than the sum of its proper divisors (29644697884).

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

20641325540 is a wasteful number, since it uses less digits than its factorization.

20641325540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23957 (or 23955 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

The spelling of 20641325540 in words is "twenty billion, six hundred forty-one million, three hundred twenty-five thousand, five hundred forty".