20928610 has 8 divisors (see below), whose sum is σ = 37671516. Its totient is φ = 8371440.

The previous prime is 20928541. The next prime is 20928629. The reversal of 20928610 is 1682902.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20331081 + 597529 = 4509^2 + 773^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1046421 + ... + 1046440.

Almost surely, 2^20928610 is an apocalyptic number.

20928610 is a deficient number, since it is larger than the sum of its proper divisors (16742906).

20928610 is a wasteful number, since it uses less digits than its factorization.

20928610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2092868.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 20928610 is about 4574.7797761204. The cubic root of 20928610 is about 275.5794284174.

The spelling of 20928610 in words is "twenty million, nine hundred twenty-eight thousand, six hundred ten".