21732060 has 96 divisors (see below), whose sum is σ = 70801920. Its totient is φ = 4877568.

The previous prime is 21732059. The next prime is 21732077. The reversal of 21732060 is 6023712.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24342 + ... + 25218.

It is an arithmetic number, because the mean of its divisors is an integer number (737520).

Almost surely, 2^21732060 is an apocalyptic number.

21732060 is a gapful number since it is divisible by the number (20) 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 21732060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35400960).

21732060 is an abundant number, since it is smaller than the sum of its proper divisors (49069860).

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

21732060 is a wasteful number, since it uses less digits than its factorization.

21732060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955 (or 953 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 21732060 is about 4661.7657598811. The cubic root of 21732060 is about 279.0617404248.

Adding to 21732060 its reverse (6023712), we get a palindrome (27755772).

The spelling of 21732060 in words is "twenty-one million, seven hundred thirty-two thousand, sixty".