20400332 has 6 divisors (see below), whose sum is σ = 35700588. Its totient is φ = 10200164.

The previous prime is 20400307. The next prime is 20400337. The reversal of 20400332 is 23300402.

It is not an unprimeable number, because it can be changed into a prime (20400337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2550038 + ... + 2550045.

It is an arithmetic number, because the mean of its divisors is an integer number (5950098).

Almost surely, 2^20400332 is an apocalyptic number.

It is an amenable number.

20400332 is a deficient number, since it is larger than the sum of its proper divisors (15300256).

20400332 is a wasteful number, since it uses less digits than its factorization.

20400332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5100087 (or 5100085 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 14.

The square root of 20400332 is about 4516.6726691227. The cubic root of 20400332 is about 273.2409238807.

Adding to 20400332 its reverse (23300402), we get a palindrome (43700734).

The spelling of 20400332 in words is "twenty million, four hundred thousand, three hundred thirty-two".