20002909440 has 144 divisors (see below), whose sum is σ = 65442960576. Its totient is φ = 5203968000.

The previous prime is 20002909403. The next prime is 20002909559. The reversal of 20002909440 is 4490920002.

It is a super-2 number, since 2×20002909440² (a number of 21 digits) contains 22 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 = 20002909398 and 20002909407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93915 + ... + 220965.

It is an arithmetic number, because the mean of its divisors is an integer number (454465004).

Almost surely, 2^20002909440 is an apocalyptic number.

20002909440 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 20002909440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32721480288).

20002909440 is an abundant number, since it is smaller than the sum of its proper divisors (45440051136).

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

20002909440 is a wasteful number, since it uses less digits than its factorization.

20002909440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127116 (or 127102 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The spelling of 20002909440 in words is "twenty billion, two million, nine hundred nine thousand, four hundred forty".