20530352040 has 128 divisors (see below), whose sum is σ = 67603161600. Its totient is φ = 4946469120.

The previous prime is 20530351999. The next prime is 20530352053. The reversal of 20530352040 is 4025303502.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20530352040.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 167451 + ... + 262869.

It is an arithmetic number, because the mean of its divisors is an integer number (528149700).

Almost surely, 2^20530352040 is an apocalyptic number.

20530352040 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 20530352040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33801580800).

20530352040 is an abundant number, since it is smaller than the sum of its proper divisors (47072809560).

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

20530352040 is a wasteful number, since it uses less digits than its factorization.

20530352040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95607 (or 95603 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 24.

Adding to 20530352040 its reverse (4025303502), we get a palindrome (24555655542).

The spelling of 20530352040 in words is "twenty billion, five hundred thirty million, three hundred fifty-two thousand, forty".