19855030 has 32 divisors (see below), whose sum is σ = 38765664. Its totient is φ = 7278336.

The previous prime is 19855021. The next prime is 19855061. The reversal of 19855030 is 3055891.

It is a junction number, because it is equal to n+sod(n) for n = 19854983 and 19855001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20722 + ... + 21658.

It is an arithmetic number, because the mean of its divisors is an integer number (1211427).

Almost surely, 2^19855030 is an apocalyptic number.

19855030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19855030 is a deficient number, since it is larger than the sum of its proper divisors (18910634).

19855030 is a wasteful number, since it uses less digits than its factorization.

19855030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 19855030 is about 4455.8983381581. The cubic root of 19855030 is about 270.7843220714.

The spelling of 19855030 in words is "nineteen million, eight hundred fifty-five thousand, thirty".