20405140433403 has 12 divisors (see below), whose sum is σ = 29905054299624. Its totient is φ = 12366751777600.

The previous prime is 20405140433393. The next prime is 20405140433473. The reversal of 20405140433403 is 30433404150402.

It is not a de Polignac number, because 20405140433403 - 2⁸ = 20405140433147 is a prime.

It is a super-2 number, since 2×20405140433403² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (20405140433473) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28106253678 + ... + 28106254403.

It is an arithmetic number, because the mean of its divisors is an integer number (2492087858302).

Almost surely, 2^{20405140433403} is an apocalyptic number.

20405140433403 is a deficient number, since it is larger than the sum of its proper divisors (9499913866221).

20405140433403 is a wasteful number, since it uses less digits than its factorization.

20405140433403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56212508106 (or 56212508095 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 33.

Adding to 20405140433403 its reverse (30433404150402), we get a palindrome (50838544583805).

The spelling of 20405140433403 in words is "twenty trillion, four hundred five billion, one hundred forty million, four hundred thirty-three thousand, four hundred three".