19975830 has 96 divisors (see below), whose sum is σ = 56733696. Its totient is φ = 4487616.

The previous prime is 19975771. The next prime is 19975843. The reversal of 19975830 is 3857991.

It is a happy number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 157227 + ... + 157353.

It is an arithmetic number, because the mean of its divisors is an integer number (590976).

Almost surely, 2^19975830 is an apocalyptic number.

19975830 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 19975830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28366848).

19975830 is an abundant number, since it is smaller than the sum of its proper divisors (36757866).

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

19975830 is a wasteful number, since it uses less digits than its factorization.

19975830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 19975830 is about 4469.4328499263. The cubic root of 19975830 is about 271.3323717921.

The spelling of 19975830 in words is "nineteen million, nine hundred seventy-five thousand, eight hundred thirty".