20828867 has 2 divisors, whose sum is σ = 20828868. Its totient is φ = 20828866.

The previous prime is 20828851. The next prime is 20828879. The reversal of 20828867 is 76882802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20828867 - 2⁴ = 20828851 is a prime.

It is not a weakly prime, because it can be changed into another prime (20828827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10414433 + 10414434.

It is an arithmetic number, because the mean of its divisors is an integer number (10414434).

Almost surely, 2^20828867 is an apocalyptic number.

20828867 is a deficient number, since it is larger than the sum of its proper divisors (1).

20828867 is an equidigital number, since it uses as much as digits as its factorization.

20828867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86016, while the sum is 41.

The square root of 20828867 is about 4563.8653573479. The cubic root of 20828867 is about 275.1409393256.

The spelling of 20828867 in words is "twenty million, eight hundred twenty-eight thousand, eight hundred sixty-seven".