19312220 has 12 divisors (see below), whose sum is σ = 40555704. Its totient is φ = 7724880.

The previous prime is 19312211. The next prime is 19312229. The reversal of 19312220 is 2221391.

It is an interprime number because it is at equal distance from previous prime (19312211) and next prime (19312229).

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 965611 = 19312220 / (1 + 9 + 3 + 1 + 2 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 19312192 and 19312201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19312229) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 482786 + ... + 482825.

It is an arithmetic number, because the mean of its divisors is an integer number (3379642).

Almost surely, 2^19312220 is an apocalyptic number.

19312220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19312220 is an abundant number, since it is smaller than the sum of its proper divisors (21243484).

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

19312220 is a wasteful number, since it uses less digits than its factorization.

19312220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965620 (or 965618 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 19312220 is about 4394.5671004093. The cubic root of 19312220 is about 268.2938597422.

The spelling of 19312220 in words is "nineteen million, three hundred twelve thousand, two hundred twenty".