20402465 has 16 divisors (see below), whose sum is σ = 26479872. Its totient is φ = 15032064.

The previous prime is 20402443. The next prime is 20402467. The reversal of 20402465 is 56420402.

It is a cyclic number.

It is not a de Polignac number, because 20402465 - 2⁸ = 20402209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20402465.

It is not an unprimeable number, because it can be changed into a prime (20402467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1442 + ... + 6548.

It is an arithmetic number, because the mean of its divisors is an integer number (1654992).

Almost surely, 2^20402465 is an apocalyptic number.

It is an amenable number.

20402465 is a deficient number, since it is larger than the sum of its proper divisors (6077407).

20402465 is a wasteful number, since it uses less digits than its factorization.

20402465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5176.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 20402465 is about 4516.9087880983. The cubic root of 20402465 is about 273.2504466437.

Adding to 20402465 its reverse (56420402), we get a palindrome (76822867).

The spelling of 20402465 in words is "twenty million, four hundred two thousand, four hundred sixty-five".