19694864 has 30 divisors (see below), whose sum is σ = 44390574. Its totient is φ = 8440320.

The previous prime is 19694863. The next prime is 19694879. The reversal of 19694864 is 46849691.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16483600 + 3211264 = 4060^2 + 1792^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19694861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11777 + ... + 13344.

Almost surely, 2^19694864 is an apocalyptic number.

19694864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

19694864 is an abundant number, since it is smaller than the sum of its proper divisors (24695710).

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

19694864 is a wasteful number, since it uses less digits than its factorization.

19694864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25143 (or 25130 counting only the distinct ones).

The product of its digits is 373248, while the sum is 47.

The square root of 19694864 is about 4437.8895885319. The cubic root of 19694864 is about 270.0542369324.

It can be divided in two parts, 196 and 94864, that multiplied together give a square (18593344 = 4312²).

The spelling of 19694864 in words is "nineteen million, six hundred ninety-four thousand, eight hundred sixty-four".