21746364 has 24 divisors (see below), whose sum is σ = 50913408. Its totient is φ = 7224240.

The previous prime is 21746363. The next prime is 21746399. The reversal of 21746364 is 46364712.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21746363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 819 + ... + 6645.

It is an arithmetic number, because the mean of its divisors is an integer number (2121392).

Almost surely, 2^21746364 is an apocalyptic number.

It is an amenable number.

21746364 is an abundant number, since it is smaller than the sum of its proper divisors (29167044).

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

21746364 is a wasteful number, since it uses less digits than its factorization.

21746364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6145 (or 6143 counting only the distinct ones).

The product of its digits is 24192, while the sum is 33.

The square root of 21746364 is about 4663.2996901336. The cubic root of 21746364 is about 279.1229529633.

The spelling of 21746364 in words is "twenty-one million, seven hundred forty-six thousand, three hundred sixty-four".