20438495 has 16 divisors (see below), whose sum is σ = 30578688. Its totient is φ = 12740640.

The previous prime is 20438447. The next prime is 20438497. The reversal of 20438495 is 59483402.

It is not a de Polignac number, because 20438495 - 2²⁰ = 19389919 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20438497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26159 + ... + 26928.

It is an arithmetic number, because the mean of its divisors is an integer number (1911168).

Almost surely, 2^20438495 is an apocalyptic number.

20438495 is a deficient number, since it is larger than the sum of its proper divisors (10140193).

20438495 is a wasteful number, since it uses less digits than its factorization.

20438495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53110.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 20438495 is about 4520.8953759184. The cubic root of 20438495 is about 273.4112021185.

The spelling of 20438495 in words is "twenty million, four hundred thirty-eight thousand, four hundred ninety-five".