19912870 has 16 divisors (see below), whose sum is σ = 36677520. Its totient is φ = 7779744.

The previous prime is 19912859. The next prime is 19912877. The reversal of 19912870 is 7821991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19912877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22725 + ... + 23584.

It is an arithmetic number, because the mean of its divisors is an integer number (2292345).

Almost surely, 2^19912870 is an apocalyptic number.

19912870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19912870 is a deficient number, since it is larger than the sum of its proper divisors (16764650).

19912870 is a wasteful number, since it uses less digits than its factorization.

19912870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46359.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 19912870 is about 4462.3838920469. The cubic root of 19912870 is about 271.0470091787.

The spelling of 19912870 in words is "nineteen million, nine hundred twelve thousand, eight hundred seventy".