19870664 has 32 divisors (see below), whose sum is σ = 40824000. Its totient is φ = 8992320.

The previous prime is 19870661. The next prime is 19870667. The reversal of 19870664 is 46607891.

It is an interprime number because it is at equal distance from previous prime (19870661) and next prime (19870667).

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (19870661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30389 + ... + 31035.

It is an arithmetic number, because the mean of its divisors is an integer number (1275750).

Almost surely, 2^19870664 is an apocalyptic number.

It is an amenable number.

19870664 is an abundant number, since it is smaller than the sum of its proper divisors (20953336).

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

19870664 is a wasteful number, since it uses less digits than its factorization.

19870664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013 (or 1009 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 19870664 is about 4457.6522968935. The cubic root of 19870664 is about 270.8553759627.

The spelling of 19870664 in words is "nineteen million, eight hundred seventy thousand, six hundred sixty-four".