20541399 has 8 divisors (see below), whose sum is σ = 27671280. Its totient is φ = 13552896.

The previous prime is 20541383. The next prime is 20541407. The reversal of 20541399 is 99314502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20541399 - 2⁴ = 20541383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20541349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35004 + ... + 35585.

It is an arithmetic number, because the mean of its divisors is an integer number (3458910).

Almost surely, 2^20541399 is an apocalyptic number.

20541399 is a deficient number, since it is larger than the sum of its proper divisors (7129881).

20541399 is an equidigital number, since it uses as much as digits as its factorization.

20541399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70689.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 20541399 is about 4532.2620180215. The cubic root of 20541399 is about 273.8692922672.

The spelling of 20541399 in words is "twenty million, five hundred forty-one thousand, three hundred ninety-nine".