19320820 has 12 divisors (see below), whose sum is σ = 40573764. Its totient is φ = 7728320.

The previous prime is 19320817. The next prime is 19320827. The reversal of 19320820 is 2802391.

It can be written as a sum of positive squares in 2 ways, for example, as 4235364 + 15085456 = 2058^2 + 3884^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19320827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 483001 + ... + 483040.

It is an arithmetic number, because the mean of its divisors is an integer number (3381147).

Almost surely, 2^19320820 is an apocalyptic number.

19320820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19320820 is an abundant number, since it is smaller than the sum of its proper divisors (21252944).

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

19320820 is a wasteful number, since it uses less digits than its factorization.

19320820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 966050 (or 966048 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 19320820 is about 4395.5454724073. The cubic root of 19320820 is about 268.3336788271. Note that the first 3 decimals are identical.

The spelling of 19320820 in words is "nineteen million, three hundred twenty thousand, eight hundred twenty".