19961850 has 48 divisors (see below), whose sum is σ = 50211072. Its totient is φ = 5247360.

The previous prime is 19961827. The next prime is 19961857. The reversal of 19961850 is 5816991.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 19961799 and 19961808.

It is not an unprimeable number, because it can be changed into a prime (19961857) 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, 10039 + ... + 11861.

It is an arithmetic number, because the mean of its divisors is an integer number (1046064).

Almost surely, 2^19961850 is an apocalyptic number.

19961850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19961850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25105536).

19961850 is an abundant number, since it is smaller than the sum of its proper divisors (30249222).

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

19961850 is a wasteful number, since it uses less digits than its factorization.

19961850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911 (or 1906 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 19961850 is about 4467.8686193755. The cubic root of 19961850 is about 271.2690600834.

The spelling of 19961850 in words is "nineteen million, nine hundred sixty-one thousand, eight hundred fifty".