20434187 has 8 divisors (see below), whose sum is σ = 21683376. Its totient is φ = 19190272.

The previous prime is 20434181. The next prime is 20434223. The reversal of 20434187 is 78143402.

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 20434187 - 2⁴ = 20434171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20434181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9068 + ... + 11094.

It is an arithmetic number, because the mean of its divisors is an integer number (2710422).

Almost surely, 2^20434187 is an apocalyptic number.

20434187 is a deficient number, since it is larger than the sum of its proper divisors (1249189).

20434187 is a wasteful number, since it uses less digits than its factorization.

20434187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2637.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 20434187 is about 4520.4188965183. The cubic root of 20434187 is about 273.3919910134.

Adding to 20434187 its reverse (78143402), we get a palindrome (98577589).

The spelling of 20434187 in words is "twenty million, four hundred thirty-four thousand, one hundred eighty-seven".