19940255020 has 72 divisors (see below), whose sum is σ = 48753714240. Its totient is φ = 6830691840.

The previous prime is 19940255017. The next prime is 19940255021. The reversal of 19940255020 is 2055204991.

It is a super-2 number, since 2×19940255020² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19940255021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1198116 + ... + 1214644.

It is an arithmetic number, because the mean of its divisors is an integer number (677134920).

Almost surely, 2^19940255020 is an apocalyptic number.

19940255020 is a gapful number since it is divisible by the number (10) 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 19940255020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24376857120).

19940255020 is an abundant number, since it is smaller than the sum of its proper divisors (28813459220).

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

19940255020 is a wasteful number, since it uses less digits than its factorization.

19940255020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17783 (or 17774 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 19940255020 in words is "nineteen billion, nine hundred forty million, two hundred fifty-five thousand, twenty".