19950840 has 384 divisors, whose sum is σ = 86184000. Its totient is φ = 4064256.

The previous prime is 19950797. The next prime is 19950841. The reversal of 19950840 is 4805991.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 19950795 and 19950804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19950841) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 687946 + ... + 687974.

Almost surely, 2^19950840 is an apocalyptic number.

19950840 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 19950840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43092000).

19950840 is an abundant number, since it is smaller than the sum of its proper divisors (66233160).

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

19950840 is a wasteful number, since it uses less digits than its factorization.

19950840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76 (or 59 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 19950840 is about 4466.6363183049. The cubic root of 19950840 is about 271.2191779061.

The spelling of 19950840 in words is "nineteen million, nine hundred fifty thousand, eight hundred forty".