20399411 has 2 divisors, whose sum is σ = 20399412. Its totient is φ = 20399410.

The previous prime is 20399389. The next prime is 20399429. The reversal of 20399411 is 11499302.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20399411 - 2⁶ = 20399347 is a prime.

It is a super-2 number, since 2×20399411² = 832271938293842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20399461) 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, 10199705 + 10199706.

It is an arithmetic number, because the mean of its divisors is an integer number (10199706).

Almost surely, 2^20399411 is an apocalyptic number.

20399411 is a deficient number, since it is larger than the sum of its proper divisors (1).

20399411 is an equidigital number, since it uses as much as digits as its factorization.

20399411 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 20399411 is about 4516.5707123879. The cubic root of 20399411 is about 273.2368118777.

The spelling of 20399411 in words is "twenty million, three hundred ninety-nine thousand, four hundred eleven".