20018345920 has 112 divisors (see below), whose sum is σ = 51425782848. Its totient is φ = 7394017280.

The previous prime is 20018345911. The next prime is 20018345927. The reversal of 20018345920 is 2954381002.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20018345927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 253605 + ... + 323035.

Almost surely, 2^20018345920 is an apocalyptic number.

20018345920 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 20018345920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25712891424).

20018345920 is an abundant number, since it is smaller than the sum of its proper divisors (31407436928).

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

20018345920 is a wasteful number, since it uses less digits than its factorization.

20018345920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69518 (or 69508 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The spelling of 20018345920 in words is "twenty billion, eighteen million, three hundred forty-five thousand, nine hundred twenty".