20001513440 has 48 divisors (see below), whose sum is σ = 48883020480. Its totient is φ = 7724720640.

The previous prime is 20001513401. The next prime is 20001513449. The reversal of 20001513440 is 4431510002.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001513449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2150696 + ... + 2159975.

It is an arithmetic number, because the mean of its divisors is an integer number (1018396260).

Almost surely, 2^20001513440 is an apocalyptic number.

20001513440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001513440 is an abundant number, since it is smaller than the sum of its proper divisors (28881507040).

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

20001513440 is a wasteful number, since it uses less digits than its factorization.

20001513440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4310715 (or 4310707 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The spelling of 20001513440 in words is "twenty billion, one million, five hundred thirteen thousand, four hundred forty".