19420218 has 24 divisors (see below), whose sum is σ = 42707808. Its totient is φ = 6376392.

The previous prime is 19420217. The next prime is 19420241. The reversal of 19420218 is 81202491.

It is a junction number, because it is equal to n+sod(n) for n = 19420191 and 19420200.

It is not an unprimeable number, because it can be changed into a prime (19420217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6846 + ... + 9257.

It is an arithmetic number, because the mean of its divisors is an integer number (1779492).

Almost surely, 2^19420218 is an apocalyptic number.

19420218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19420218 is an abundant number, since it is smaller than the sum of its proper divisors (23287590).

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

19420218 is a wasteful number, since it uses less digits than its factorization.

19420218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16178 (or 16175 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 19420218 is about 4406.8376416655. The cubic root of 19420218 is about 268.7930489540.

The spelling of 19420218 in words is "nineteen million, four hundred twenty thousand, two hundred eighteen".