20400476 has 12 divisors (see below), whose sum is σ = 37801008. Its totient is φ = 9600192.

The previous prime is 20400473. The next prime is 20400481. The reversal of 20400476 is 67400402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149936 + ... + 150071.

It is an arithmetic number, because the mean of its divisors is an integer number (3150084).

Almost surely, 2^20400476 is an apocalyptic number.

It is an amenable number.

20400476 is a deficient number, since it is larger than the sum of its proper divisors (17400532).

20400476 is a wasteful number, since it uses less digits than its factorization.

20400476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300028 (or 300026 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 20400476 is about 4516.6886100328. The cubic root of 20400476 is about 273.2415667886.

Adding to 20400476 its reverse (67400402), we get a palindrome (87800878).

The spelling of 20400476 in words is "twenty million, four hundred thousand, four hundred seventy-six".