21830746 has 16 divisors (see below), whose sum is σ = 37797120. Its totient is φ = 9262800.

The previous prime is 21830719. The next prime is 21830759. The reversal of 21830746 is 64703812.

21830746 = 414² + 415² + ... + 514².

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6306 + ... + 9133.

It is an arithmetic number, because the mean of its divisors is an integer number (2362320).

Almost surely, 2^21830746 is an apocalyptic number.

21830746 is a deficient number, since it is larger than the sum of its proper divisors (15966374).

21830746 is a wasteful number, since it uses less digits than its factorization.

21830746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15549.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 21830746 is about 4672.3383867182. The cubic root of 21830746 is about 279.4835121583.

The spelling of 21830746 in words is "twenty-one million, eight hundred thirty thousand, seven hundred forty-six".