19420905 has 24 divisors (see below), whose sum is σ = 36148032. Its totient is φ = 8877792.

The previous prime is 19420903. The next prime is 19420913. The reversal of 19420905 is 50902491.

It is a happy number.

It is not a de Polignac number, because 19420905 - 2¹ = 19420903 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19420903) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12477 + ... + 13946.

It is an arithmetic number, because the mean of its divisors is an integer number (1506168).

Almost surely, 2^19420905 is an apocalyptic number.

19420905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19420905 is a deficient number, since it is larger than the sum of its proper divisors (16727127).

19420905 is a wasteful number, since it uses less digits than its factorization.

19420905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26445 (or 26438 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 19420905 is about 4406.9155880275. The cubic root of 19420905 is about 268.7962184798.

The spelling of 19420905 in words is "nineteen million, four hundred twenty thousand, nine hundred five".