20402316 has 36 divisors (see below), whose sum is σ = 56262024. Its totient is φ = 6182400.

The previous prime is 20402287. The next prime is 20402321. The reversal of 20402316 is 61320402.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 25365 + ... + 26156.

It is an arithmetic number, because the mean of its divisors is an integer number (1562834).

Almost surely, 2^20402316 is an apocalyptic number.

It is an amenable number.

20402316 is an abundant number, since it is smaller than the sum of its proper divisors (35859708).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20402316 is a wasteful number, since it uses less digits than its factorization.

20402316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51542 (or 51537 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 20402316 is about 4516.8922944874. The cubic root of 20402316 is about 273.2497814559.

Adding to 20402316 its reverse (61320402), we get a palindrome (81722718).

It can be divided in two parts, 2040 and 2316, that added together give a square (4356 = 66²).

The spelling of 20402316 in words is "twenty million, four hundred two thousand, three hundred sixteen".