20525530440 has 32 divisors (see below), whose sum is σ = 61576591680. Its totient is φ = 5473474752.

The previous prime is 20525530357. The next prime is 20525530457. The reversal of 20525530440 is 4403552502.

It is a super-3 number, since 3×20525530440³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 20525530398 and 20525530407.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85522924 + ... + 85523163.

It is an arithmetic number, because the mean of its divisors is an integer number (1924268490).

Almost surely, 2^20525530440 is an apocalyptic number.

20525530440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20525530440 is an abundant number, since it is smaller than the sum of its proper divisors (41051061240).

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

20525530440 is a wasteful number, since it uses less digits than its factorization.

20525530440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171046101 (or 171046097 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 30.

The spelling of 20525530440 in words is "twenty billion, five hundred twenty-five million, five hundred thirty thousand, four hundred forty".