20238495840 has 192 divisors, whose sum is σ = 70901913600. Its totient is φ = 5391816192.

The previous prime is 20238495833. The next prime is 20238495859. The reversal of 20238495840 is 4859483202.

20238495840 is a `hidden beast` number, since 2 + 0 + 23 + 8 + 49 + 584 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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, 7442001 + ... + 7444719.

It is an arithmetic number, because the mean of its divisors is an integer number (369280800).

Almost surely, 2^20238495840 is an apocalyptic number.

20238495840 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 20238495840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35450956800).

20238495840 is an abundant number, since it is smaller than the sum of its proper divisors (50663417760).

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

20238495840 is a wasteful number, since it uses less digits than its factorization.

20238495840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4466 (or 4452 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The spelling of 20238495840 in words is "twenty billion, two hundred thirty-eight million, four hundred ninety-five thousand, eight hundred forty".