20750399 has 8 divisors (see below), whose sum is σ = 21537360. Its totient is φ = 19968256.

The previous prime is 20750371. The next prime is 20750407. The reversal of 20750399 is 99305702.

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

It is a cyclic number.

It is not a de Polignac number, because 20750399 - 2¹² = 20746303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20750329) 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 in 7 ways as a sum of consecutive naturals, for example, 9224 + ... + 11250.

It is an arithmetic number, because the mean of its divisors is an integer number (2692170).

Almost surely, 2^20750399 is an apocalyptic number.

20750399 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20750399 is a deficient number, since it is larger than the sum of its proper divisors (786961).

20750399 is a wasteful number, since it uses less digits than its factorization.

20750399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2409.

The product of its (nonzero) digits is 17010, while the sum is 35.

The square root of 20750399 is about 4555.2605853014. The cubic root of 20750399 is about 274.7949943188.

The spelling of 20750399 in words is "twenty million, seven hundred fifty thousand, three hundred ninety-nine".