20401384 has 32 divisors (see below), whose sum is σ = 40435200. Its totient is φ = 9634240.

The previous prime is 20401361. The next prime is 20401397. The reversal of 20401384 is 48310402.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9969 + ... + 11839.

It is an arithmetic number, because the mean of its divisors is an integer number (1263600).

Almost surely, 2^20401384 is an apocalyptic number.

It is an amenable number.

20401384 is a deficient number, since it is larger than the sum of its proper divisors (20033816).

20401384 is a wasteful number, since it uses less digits than its factorization.

20401384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1953 (or 1949 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 20401384 is about 4516.7891250312. The cubic root of 20401384 is about 273.2456206100.

Adding to 20401384 its reverse (48310402), we get a palindrome (68711786).

The spelling of 20401384 in words is "twenty million, four hundred one thousand, three hundred eighty-four".