20928107 has 2 divisors, whose sum is σ = 20928108. Its totient is φ = 20928106.

The previous prime is 20928079. The next prime is 20928157. The reversal of 20928107 is 70182902.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20928107 - 2⁶ = 20928043 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20928107.

It is not a weakly prime, because it can be changed into another prime (20928157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10464053 + 10464054.

It is an arithmetic number, because the mean of its divisors is an integer number (10464054).

Almost surely, 2^20928107 is an apocalyptic number.

20928107 is a deficient number, since it is larger than the sum of its proper divisors (1).

20928107 is an equidigital number, since it uses as much as digits as its factorization.

20928107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 20928107 is about 4574.7248004661. The cubic root of 20928107 is about 275.5772206332.

The spelling of 20928107 in words is "twenty million, nine hundred twenty-eight thousand, one hundred seven".