21740504 has 8 divisors (see below), whose sum is σ = 40763460. Its totient is φ = 10870248.

The previous prime is 21740491. The next prime is 21740533. The reversal of 21740504 is 40504712.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 21740504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1358774 + ... + 1358789.

Almost surely, 2^21740504 is an apocalyptic number.

It is an amenable number.

21740504 is a deficient number, since it is larger than the sum of its proper divisors (19022956).

21740504 is a wasteful number, since it uses less digits than its factorization.

21740504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2717569 (or 2717565 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 21740504 is about 4662.6713373344. The cubic root of 21740504 is about 279.0978789257.

The spelling of 21740504 in words is "twenty-one million, seven hundred forty thousand, five hundred four".