20051431405 has 32 divisors (see below), whose sum is σ = 26841196800. Its totient is φ = 14290578432.

The previous prime is 20051431399. The next prime is 20051431427. The reversal of 20051431405 is 50413415002.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20051431405 - 2³ = 20051431397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20051431405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2125479 + ... + 2134891.

It is an arithmetic number, because the mean of its divisors is an integer number (838787400).

Almost surely, 2^20051431405 is an apocalyptic number.

It is an amenable number.

20051431405 is a deficient number, since it is larger than the sum of its proper divisors (6789765395).

20051431405 is a wasteful number, since it uses less digits than its factorization.

20051431405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10773.

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 20051431405 its reverse (50413415002), we get a palindrome (70464846407).

The spelling of 20051431405 in words is "twenty billion, fifty-one million, four hundred thirty-one thousand, four hundred five".