20928573 has 24 divisors (see below), whose sum is σ = 31711680. Its totient is φ = 13285440.

The previous prime is 20928541. The next prime is 20928629. The reversal of 20928573 is 37582902.

It is a happy number.

It is not a de Polignac number, because 20928573 - 2⁵ = 20928541 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20928073) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15208 + ... + 16526.

It is an arithmetic number, because the mean of its divisors is an integer number (1321320).

Almost surely, 2^20928573 is an apocalyptic number.

It is an amenable number.

20928573 is a deficient number, since it is larger than the sum of its proper divisors (10783107).

20928573 is a wasteful number, since it uses less digits than its factorization.

20928573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409 (or 1406 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 20928573 is about 4574.7757322081. The cubic root of 20928573 is about 275.5792660170.

It can be divided in two parts, 209 and 28573, that added together give a palindrome (28782).

The spelling of 20928573 in words is "twenty million, nine hundred twenty-eight thousand, five hundred seventy-three".