20431033412555 has 64 divisors (see below), whose sum is σ = 25529110806528. Its totient is φ = 15686657925120.

The previous prime is 20431033412507. The next prime is 20431033412567. The reversal of 20431033412555 is 55521433013402.

It is not a de Polignac number, because 20431033412555 - 2¹² = 20431033408459 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2338445147 + ... + 2338453883.

It is an arithmetic number, because the mean of its divisors is an integer number (398892356352).

Almost surely, 2^{20431033412555} is an apocalyptic number.

20431033412555 is a deficient number, since it is larger than the sum of its proper divisors (5098077393973).

20431033412555 is a wasteful number, since it uses less digits than its factorization.

20431033412555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9636.

The product of its (nonzero) digits is 216000, while the sum is 38.

Adding to 20431033412555 its reverse (55521433013402), we get a palindrome (75952466425957).

The spelling of 20431033412555 in words is "twenty trillion, four hundred thirty-one billion, thirty-three million, four hundred twelve thousand, five hundred fifty-five".