19801330 has 16 divisors (see below), whose sum is σ = 36315864. Its totient is φ = 7770880.

The previous prime is 19801307. The next prime is 19801337. The reversal of 19801330 is 3310891.

It can be written as a sum of positive squares in 4 ways, for example, as 18584721 + 1216609 = 4311^2 + 1103^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19801295 and 19801304.

It is not an unprimeable number, because it can be changed into a prime (19801337) 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, 18151 + ... + 19210.

Almost surely, 2^19801330 is an apocalyptic number.

19801330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19801330 is a deficient number, since it is larger than the sum of its proper divisors (16514534).

19801330 is a wasteful number, since it uses less digits than its factorization.

19801330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37421.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 19801330 is about 4449.8685373840. The cubic root of 19801330 is about 270.5399801733.

The spelling of 19801330 in words is "nineteen million, eight hundred one thousand, three hundred thirty".