20099457 has 48 divisors (see below), whose sum is σ = 35942400. Its totient is φ = 10781568.

The previous prime is 20099437. The next prime is 20099477. The reversal of 20099457 is 75499002.

It is an interprime number because it is at equal distance from previous prime (20099437) and next prime (20099477).

It is not a de Polignac number, because 20099457 - 2¹¹ = 20097409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20099437) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 52288 + ... + 52670.

It is an arithmetic number, because the mean of its divisors is an integer number (748800).

Almost surely, 2^20099457 is an apocalyptic number.

It is an amenable number.

20099457 is a deficient number, since it is larger than the sum of its proper divisors (15842943).

20099457 is a wasteful number, since it uses less digits than its factorization.

20099457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427 (or 410 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 20099457 is about 4483.2417958437. The cubic root of 20099457 is about 271.8909642627.

The spelling of 20099457 in words is "twenty million, ninety-nine thousand, four hundred fifty-seven".