20108465 has 24 divisors (see below), whose sum is σ = 26681400. Its totient is φ = 14536704.

The previous prime is 20108461. The next prime is 20108483. The reversal of 20108465 is 56480102.

20108465 = 327² + 328² + ... + 456².

It can be written as a sum of positive squares in 12 ways, for example, as 8025889 + 12082576 = 2833^2 + 3476^2 .

It is not a de Polignac number, because 20108465 - 2² = 20108461 is a prime.

It is a super-3 number, since 3×20108465³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20108461) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44561 + ... + 45009.

It is an arithmetic number, because the mean of its divisors is an integer number (1111725).

Almost surely, 2^20108465 is an apocalyptic number.

It is an amenable number.

20108465 is a deficient number, since it is larger than the sum of its proper divisors (6572935).

20108465 is a wasteful number, since it uses less digits than its factorization.

20108465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533 (or 520 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 20108465 is about 4484.2463134846. The cubic root of 20108465 is about 271.9315761063.

Adding to 20108465 its reverse (56480102), we get a palindrome (76588567).

The spelling of 20108465 in words is "twenty million, one hundred eight thousand, four hundred sixty-five".