20403081 has 12 divisors (see below), whose sum is σ = 29747952. Its totient is φ = 13474296.

The previous prime is 20403073. The next prime is 20403083. The reversal of 20403081 is 18030402.

It is a happy number.

It is not a de Polignac number, because 20403081 - 2³ = 20403073 is a prime.

It is a super-2 number, since 2×20403081² = 832571428585122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20403083) 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 11 ways as a sum of consecutive naturals, for example, 9631 + ... + 11556.

It is an arithmetic number, because the mean of its divisors is an integer number (2478996).

Almost surely, 2^20403081 is an apocalyptic number.

It is an amenable number.

20403081 is a deficient number, since it is larger than the sum of its proper divisors (9344871).

20403081 is a wasteful number, since it uses less digits than its factorization.

20403081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21300 (or 21297 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 20403081 is about 4516.9769758103. The cubic root of 20403081 is about 273.2531966477.

Adding to 20403081 its reverse (18030402), we get a palindrome (38433483).

The spelling of 20403081 in words is "twenty million, four hundred three thousand, eighty-one".