19720476 has 96 divisors (see below), whose sum is σ = 56609280. Its totient is φ = 5905152.

The previous prime is 19720471. The next prime is 19720487. The reversal of 19720476 is 67402791.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 19720476.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19720471) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41995 + ... + 42461.

It is an arithmetic number, because the mean of its divisors is an integer number (589680).

Almost surely, 2^19720476 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19720476, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28304640).

19720476 is an abundant number, since it is smaller than the sum of its proper divisors (36888804).

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

19720476 is a wasteful number, since it uses less digits than its factorization.

19720476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520 (or 512 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 19720476 is about 4440.7742568160. The cubic root of 19720476 is about 270.1712493856.

The spelling of 19720476 in words is "nineteen million, seven hundred twenty thousand, four hundred seventy-six".