19819854 has 12 divisors (see below), whose sum is σ = 42943056. Its totient is φ = 6606612.

The previous prime is 19819843. The next prime is 19819883. The reversal of 19819854 is 45891891.

It is a super-2 number, since 2×19819854² = 785653225162632, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 550534 + ... + 550569.

It is an arithmetic number, because the mean of its divisors is an integer number (3578588).

Almost surely, 2^19819854 is an apocalyptic number.

19819854 is an abundant number, since it is smaller than the sum of its proper divisors (23123202).

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

19819854 is a wasteful number, since it uses less digits than its factorization.

19819854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101111 (or 1101108 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The square root of 19819854 is about 4451.9494606296. The cubic root of 19819854 is about 270.6243166071.

The spelling of 19819854 in words is "nineteen million, eight hundred nineteen thousand, eight hundred fifty-four".