19942656 has 72 divisors (see below), whose sum is σ = 55433280. Its totient is φ = 6352896.

The previous prime is 19942621. The next prime is 19942661. The reversal of 19942656 is 65624991.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17100 + ... + 18228.

Almost surely, 2^19942656 is an apocalyptic number.

19942656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19942656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27716640).

19942656 is an abundant number, since it is smaller than the sum of its proper divisors (35490624).

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

19942656 is a wasteful number, since it uses less digits than its factorization.

19942656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1171 (or 1157 counting only the distinct ones).

The product of its digits is 116640, while the sum is 42.

The square root of 19942656 is about 4465.7200987075. The cubic root of 19942656 is about 271.1820873821.

The spelling of 19942656 in words is "nineteen million, nine hundred forty-two thousand, six hundred fifty-six".