20898667 has 2 divisors, whose sum is σ = 20898668. Its totient is φ = 20898666.

The previous prime is 20898649. The next prime is 20898677. The reversal of 20898667 is 76689802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20898667 - 2²³ = 12510059 is a prime.

It is not a weakly prime, because it can be changed into another prime (20898677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10449333 + 10449334.

It is an arithmetic number, because the mean of its divisors is an integer number (10449334).

Almost surely, 2^20898667 is an apocalyptic number.

20898667 is a deficient number, since it is larger than the sum of its proper divisors (1).

20898667 is an equidigital number, since it uses as much as digits as its factorization.

20898667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 20898667 is about 4571.5059881838. The cubic root of 20898667 is about 275.4479399392.

The spelling of 20898667 in words is "twenty million, eight hundred ninety-eight thousand, six hundred sixty-seven".