20699401 has 2 divisors, whose sum is σ = 20699402. Its totient is φ = 20699400.

The previous prime is 20699363. The next prime is 20699407. The reversal of 20699401 is 10499602.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19149376 + 1550025 = 4376^2 + 1245^2 .

It is a cyclic number.

It is not a de Polignac number, because 20699401 - 2¹¹ = 20697353 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20699407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10349700 + 10349701.

It is an arithmetic number, because the mean of its divisors is an integer number (10349701).

Almost surely, 2^20699401 is an apocalyptic number.

It is an amenable number.

20699401 is a deficient number, since it is larger than the sum of its proper divisors (1).

20699401 is an equidigital number, since it uses as much as digits as its factorization.

20699401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 20699401 is about 4549.6594378041. The cubic root of 20699401 is about 274.5696895508.

The spelling of 20699401 in words is "twenty million, six hundred ninety-nine thousand, four hundred one".