20144399 has 16 divisors (see below), whose sum is σ = 22667040. Its totient is φ = 17746560.

The previous prime is 20144387. The next prime is 20144417. The reversal of 20144399 is 99344102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20144399 - 2⁸ = 20144143 is a prime.

It is a super-2 number, since 2×20144399² = 811593622142402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20144599) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63389 + ... + 63705.

It is an arithmetic number, because the mean of its divisors is an integer number (1416690).

Almost surely, 2^20144399 is an apocalyptic number.

20144399 is a deficient number, since it is larger than the sum of its proper divisors (2522641).

20144399 is a wasteful number, since it uses less digits than its factorization.

20144399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 20144399 is about 4488.2512184591. The cubic root of 20144399 is about 272.0934610702.

The spelling of 20144399 in words is "twenty million, one hundred forty-four thousand, three hundred ninety-nine".