19955700 has 144 divisors (see below), whose sum is σ = 67704000. Its totient is φ = 5028480.

The previous prime is 19955653. The next prime is 19955711. The reversal of 19955700 is 755991.

It is a happy number.

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

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, 51106 + ... + 51494.

Almost surely, 2^19955700 is an apocalyptic number.

19955700 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 19955700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33852000).

19955700 is an abundant number, since it is smaller than the sum of its proper divisors (47748300).

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

19955700 is a wasteful number, since it uses less digits than its factorization.

19955700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431 (or 418 counting only the distinct ones).

The product of its (nonzero) digits is 14175, while the sum is 36.

The square root of 19955700 is about 4467.1803187246. The cubic root of 19955700 is about 271.2411990037.

The spelling of 19955700 in words is "nineteen million, nine hundred fifty-five thousand, seven hundred".