20928842 has 16 divisors (see below), whose sum is σ = 36050400. Its totient is φ = 9012240.

The previous prime is 20928841. The next prime is 20928847. The reversal of 20928842 is 24882902.

It is not an unprimeable number, because it can be changed into a prime (20928841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24617 + ... + 25452.

It is an arithmetic number, because the mean of its divisors is an integer number (2253150).

Almost surely, 2^20928842 is an apocalyptic number.

20928842 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20928842 is a deficient number, since it is larger than the sum of its proper divisors (15121558).

20928842 is a wasteful number, since it uses less digits than its factorization.

20928842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50101.

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 20928842 is about 4574.8051324619. The cubic root of 20928842 is about 275.5804467075.

The spelling of 20928842 in words is "twenty million, nine hundred twenty-eight thousand, eight hundred forty-two".