19720885 has 8 divisors (see below), whose sum is σ = 23691096. Its totient is φ = 15759360.

The previous prime is 19720853. The next prime is 19720891. The reversal of 19720885 is 58802791.

It can be written as a sum of positive squares in 4 ways, for example, as 14085009 + 5635876 = 3753^2 + 2374^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19720885 - 2⁵ = 19720853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4965 + ... + 8005.

It is an arithmetic number, because the mean of its divisors is an integer number (2961387).

Almost surely, 2^19720885 is an apocalyptic number.

It is an amenable number.

19720885 is a deficient number, since it is larger than the sum of its proper divisors (3970211).

19720885 is a wasteful number, since it uses less digits than its factorization.

19720885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4343.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 19720885 is about 4440.8203071054. The cubic root of 19720885 is about 270.1731171444.

The spelling of 19720885 in words is "nineteen million, seven hundred twenty thousand, eight hundred eighty-five".