20404382 has 4 divisors (see below), whose sum is σ = 30606576. Its totient is φ = 10202190.

The previous prime is 20404361. The next prime is 20404387. The reversal of 20404382 is 28340402.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5101094 + ... + 5101097.

It is an arithmetic number, because the mean of its divisors is an integer number (7651644).

Almost surely, 2^20404382 is an apocalyptic number.

20404382 is a deficient number, since it is larger than the sum of its proper divisors (10202194).

20404382 is a wasteful number, since it uses less digits than its factorization.

20404382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10202193.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 20404382 is about 4517.1209857607. The cubic root of 20404382 is about 273.2590045100.

Adding to 20404382 its reverse (28340402), we get a palindrome (48744784).

The spelling of 20404382 in words is "twenty million, four hundred four thousand, three hundred eighty-two".