20400232 has 32 divisors (see below), whose sum is σ = 40423680. Its totient is φ = 9636480.

The previous prime is 20400197. The next prime is 20400239. The reversal of 20400232 is 23200402.

It is not an unprimeable number, because it can be changed into a prime (20400239) 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 7 ways as a sum of consecutive naturals, for example, 9708 + ... + 11620.

It is an arithmetic number, because the mean of its divisors is an integer number (1263240).

Almost surely, 2^20400232 is an apocalyptic number.

It is an amenable number.

20400232 is a deficient number, since it is larger than the sum of its proper divisors (20023448).

20400232 is a wasteful number, since it uses less digits than its factorization.

20400232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1993 (or 1989 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 13.

The square root of 20400232 is about 4516.6615990131. The cubic root of 20400232 is about 273.2404774152.

Adding to 20400232 its reverse (23200402), we get a palindrome (43600634).

The spelling of 20400232 in words is "twenty million, four hundred thousand, two hundred thirty-two".