20389667 has 2 divisors, whose sum is σ = 20389668. Its totient is φ = 20389666.

The previous prime is 20389657. The next prime is 20389727. The reversal of 20389667 is 76698302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20389667 - 2¹² = 20385571 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20389657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10194833 + 10194834.

It is an arithmetic number, because the mean of its divisors is an integer number (10194834).

Almost surely, 2^20389667 is an apocalyptic number.

20389667 is a deficient number, since it is larger than the sum of its proper divisors (1).

20389667 is an equidigital number, since it uses as much as digits as its factorization.

20389667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 20389667 is about 4515.4918890415. The cubic root of 20389667 is about 273.1933001064.

The spelling of 20389667 in words is "twenty million, three hundred eighty-nine thousand, six hundred sixty-seven".