20400424143431 has 4 divisors (see below), whose sum is σ = 20530363150872. Its totient is φ = 20270485135992.

The previous prime is 20400424143427. The next prime is 20400424143439. The reversal of 20400424143431 is 13434142400402.

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

It is a cyclic number.

It is not a de Polignac number, because 20400424143431 - 2² = 20400424143427 is a prime.

It is a super-2 number, since 2×20400424143431² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400424143439) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 64969503485 + ... + 64969503798.

It is an arithmetic number, because the mean of its divisors is an integer number (5132590787718).

Almost surely, 2^{20400424143431} is an apocalyptic number.

20400424143431 is a deficient number, since it is larger than the sum of its proper divisors (129939007441).

20400424143431 is a wasteful number, since it uses less digits than its factorization.

20400424143431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129939007440.

The product of its (nonzero) digits is 36864, while the sum is 32.

Adding to 20400424143431 its reverse (13434142400402), we get a palindrome (33834566543833).

The spelling of 20400424143431 in words is "twenty trillion, four hundred billion, four hundred twenty-four million, one hundred forty-three thousand, four hundred thirty-one".