20471495 has 16 divisors (see below), whose sum is σ = 27965952. Its totient is φ = 14240160.

The previous prime is 20471489. The next prime is 20471497. The reversal of 20471495 is 59417402.

20471495 = 267² + 268² + ... + 431².

It is a happy number.

It is not a de Polignac number, because 20471495 - 2²⁴ = 3694279 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 (20471497) 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, 6827 + ... + 9356.

It is an arithmetic number, because the mean of its divisors is an integer number (1747872).

Almost surely, 2^20471495 is an apocalyptic number.

20471495 is a deficient number, since it is larger than the sum of its proper divisors (7494457).

20471495 is a wasteful number, since it uses less digits than its factorization.

20471495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16222.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 20471495 is about 4524.5436233945. The cubic root of 20471495 is about 273.5582729290.

Adding to 20471495 its reverse (59417402), we get a palindrome (79888897).

The spelling of 20471495 in words is "twenty million, four hundred seventy-one thousand, four hundred ninety-five".