19813970 has 64 divisors (see below), whose sum is σ = 41057280. Its totient is φ = 6820800.

The previous prime is 19813967. The next prime is 19813987. The reversal of 19813970 is 7931891.

It is a super-3 number, since 3×19813970³ (a number of 23 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 279035 + ... + 279105.

It is an arithmetic number, because the mean of its divisors is an integer number (641520).

Almost surely, 2^19813970 is an apocalyptic number.

19813970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19813970 is an abundant number, since it is smaller than the sum of its proper divisors (21243310).

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

19813970 is a wasteful number, since it uses less digits than its factorization.

19813970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 19813970 is about 4451.2885774796. The cubic root of 19813970 is about 270.5975335124.

The spelling of 19813970 in words is "nineteen million, eight hundred thirteen thousand, nine hundred seventy".