21740748 has 24 divisors (see below), whose sum is σ = 51180528. Its totient is φ = 7182336.

The previous prime is 21740729. The next prime is 21740753. The reversal of 21740748 is 84704712.

It is a plaindrome in base 16.

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, 6661 + ... + 9372.

It is an arithmetic number, because the mean of its divisors is an integer number (2132522).

Almost surely, 2^21740748 is an apocalyptic number.

It is an amenable number.

21740748 is an abundant number, since it is smaller than the sum of its proper divisors (29439780).

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

21740748 is a wasteful number, since it uses less digits than its factorization.

21740748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16153 (or 16151 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 33.

The square root of 21740748 is about 4662.6975025193. The cubic root of 21740748 is about 279.0989230540.

The spelling of 21740748 in words is "twenty-one million, seven hundred forty thousand, seven hundred forty-eight".