20402495 has 32 divisors (see below), whose sum is σ = 27095040. Its totient is φ = 14699520.

The previous prime is 20402491. The next prime is 20402497. The reversal of 20402495 is 59420402.

It is not a de Polignac number, because 20402495 - 2² = 20402491 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402491) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 210287 + ... + 210383.

It is an arithmetic number, because the mean of its divisors is an integer number (846720).

Almost surely, 2^20402495 is an apocalyptic number.

20402495 is a deficient number, since it is larger than the sum of its proper divisors (6692545).

20402495 is a wasteful number, since it uses less digits than its factorization.

20402495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20402495 is about 4516.9121089523. The cubic root of 20402495 is about 273.2505805738.

Adding to 20402495 its reverse (59420402), we get a palindrome (79822897).

The spelling of 20402495 in words is "twenty million, four hundred two thousand, four hundred ninety-five".