19820725 has 24 divisors (see below), whose sum is σ = 26281800. Its totient is φ = 14776320.

The previous prime is 19820711. The next prime is 19820737. The reversal of 19820725 is 52702891.

It can be written as a sum of positive squares in 12 ways, for example, as 13256881 + 6563844 = 3641^2 + 2562^2 .

It is not a de Polignac number, because 19820725 - 2¹⁹ = 19296437 is a prime.

It is a super-2 number, since 2×19820725² = 785722279051250, which contains 22 as substring.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63169 + ... + 63481.

It is an arithmetic number, because the mean of its divisors is an integer number (1095075).

Almost surely, 2^19820725 is an apocalyptic number.

It is an amenable number.

19820725 is a deficient number, since it is larger than the sum of its proper divisors (6461075).

19820725 is a wasteful number, since it uses less digits than its factorization.

19820725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 484 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 19820725 is about 4452.0472818693. The cubic root of 19820725 is about 270.6282808194.

The spelling of 19820725 in words is "nineteen million, eight hundred twenty thousand, seven hundred twenty-five".