20402365 has 16 divisors (see below), whose sum is σ = 25105536. Its totient is φ = 15912000.

The previous prime is 20402351. The next prime is 20402381. The reversal of 20402365 is 56320402.

It is a happy number.

It is not a de Polignac number, because 20402365 - 2¹³ = 20394173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45834 + ... + 46276.

It is an arithmetic number, because the mean of its divisors is an integer number (1569096).

Almost surely, 2^20402365 is an apocalyptic number.

It is an amenable number.

20402365 is a deficient number, since it is larger than the sum of its proper divisors (4703171).

20402365 is a wasteful number, since it uses less digits than its factorization.

20402365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 20402365 is about 4516.8977185675. The cubic root of 20402365 is about 273.2500002093.

Adding to 20402365 its reverse (56320402), we get a palindrome (76722767).

The spelling of 20402365 in words is "twenty million, four hundred two thousand, three hundred sixty-five".