21740926 has 8 divisors (see below), whose sum is σ = 34529760. Its totient is φ = 10231008.

The previous prime is 21740903. The next prime is 21740963. The reversal of 21740926 is 62904712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319686 + ... + 319753.

It is an arithmetic number, because the mean of its divisors is an integer number (4316220).

Almost surely, 2^21740926 is an apocalyptic number.

21740926 is a deficient number, since it is larger than the sum of its proper divisors (12788834).

21740926 is a wasteful number, since it uses less digits than its factorization.

21740926 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639458.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 21740926 is about 4662.7165901436. The cubic root of 21740926 is about 279.0996847493.

The spelling of 21740926 in words is "twenty-one million, seven hundred forty thousand, nine hundred twenty-six".