20501335040 has 88 divisors (see below), whose sum is σ = 49356445200. Its totient is φ = 8170979328.

The previous prime is 20501335037. The next prime is 20501335067. The reversal of 20501335040 is 4053310502.

It is a junction number, because it is equal to n+sod(n) for n = 20501334997 and 20501335015.

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, 1441886 + ... + 1456034.

Almost surely, 2^20501335040 is an apocalyptic number.

20501335040 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 20501335040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24678222600).

20501335040 is an abundant number, since it is smaller than the sum of its proper divisors (28855110160).

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

20501335040 is a wasteful number, since it uses less digits than its factorization.

20501335040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14457 (or 14439 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 23.

Adding to 20501335040 its reverse (4053310502), we get a palindrome (24554645542).

The spelling of 20501335040 in words is "twenty billion, five hundred one million, three hundred thirty-five thousand, forty".