19912956 has 96 divisors (see below), whose sum is σ = 56179200. Its totient is φ = 5370624.

The previous prime is 19912951. The next prime is 19912961. The reversal of 19912956 is 65921991.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (19912951) and next prime (19912961).

It is a Harshad number since it is a multiple of its sum of digits (42).

Its product of digits (43740) is a multiple of the sum of its prime factors (243).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19912951) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 133570 + ... + 133718.

It is an arithmetic number, because the mean of its divisors is an integer number (585200).

Almost surely, 2^19912956 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19912956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28089600).

19912956 is an abundant number, since it is smaller than the sum of its proper divisors (36266244).

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

19912956 is a wasteful number, since it uses less digits than its factorization.

19912956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243 (or 241 counting only the distinct ones).

The product of its digits is 43740, while the sum is 42.

The square root of 19912956 is about 4462.3935281416. The cubic root of 19912956 is about 271.0473993788.

The spelling of 19912956 in words is "nineteen million, nine hundred twelve thousand, nine hundred fifty-six".