19949720 has 32 divisors (see below), whose sum is σ = 51300000. Its totient is φ = 6839808.

The previous prime is 19949689. The next prime is 19949723. The reversal of 19949720 is 2794991.

It is a happy number.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19949723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35345 + ... + 35904.

It is an arithmetic number, because the mean of its divisors is an integer number (1603125).

Almost surely, 2^19949720 is an apocalyptic number.

19949720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19949720 is an abundant number, since it is smaller than the sum of its proper divisors (31350280).

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

19949720 is a wasteful number, since it uses less digits than its factorization.

19949720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71267 (or 71263 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 19949720 is about 4466.5109425591. The cubic root of 19949720 is about 271.2141025782.

The spelling of 19949720 in words is "nineteen million, nine hundred forty-nine thousand, seven hundred twenty".