21960736 has 96 divisors (see below), whose sum is σ = 53706240. Its totient is φ = 8626176.

The previous prime is 21960727. The next prime is 21960767. The reversal of 21960736 is 63706912.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 277945 + ... + 278023.

It is an arithmetic number, because the mean of its divisors is an integer number (559440).

Almost surely, 2^21960736 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 21960736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26853120).

21960736 is an abundant number, since it is smaller than the sum of its proper divisors (31745504).

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

21960736 is a wasteful number, since it uses less digits than its factorization.

21960736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 21960736 is about 4686.2283341724. The cubic root of 21960736 is about 280.0371379311.

The spelling of 21960736 in words is "twenty-one million, nine hundred sixty thousand, seven hundred thirty-six".