21620048 has 10 divisors (see below), whose sum is σ = 41888874. Its totient is φ = 10810016.

The previous prime is 21620021. The next prime is 21620059. The reversal of 21620048 is 84002612.

It can be written as a sum of positive squares in only one way, i.e., 20866624 + 753424 = 4568^2 + 868^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 675611 + ... + 675642.

Almost surely, 2^21620048 is an apocalyptic number.

It is an amenable number.

21620048 is a deficient number, since it is larger than the sum of its proper divisors (20268826).

21620048 is a wasteful number, since it uses less digits than its factorization.

21620048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351261 (or 1351255 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 21620048 is about 4649.7363366109. The cubic root of 21620048 is about 278.5814650152.

The spelling of 21620048 in words is "twenty-one million, six hundred twenty thousand, forty-eight".