20615436051231 has 24 divisors (see below), whose sum is σ = 31975336949760. Its totient is φ = 11780111047152.

The previous prime is 20615436051191. The next prime is 20615436051263. The reversal of 20615436051231 is 13215063451602.

It is a happy number.

It is not a de Polignac number, because 20615436051231 - 2¹⁰ = 20615436050207 is a prime.

It is a super-2 number, since 2×20615436051231² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20615436051231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20615436051281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12488080 + ... + 14042186.

It is an arithmetic number, because the mean of its divisors is an integer number (1332305706240).

Almost surely, 2^{20615436051231} is an apocalyptic number.

20615436051231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20615436051231 is a deficient number, since it is larger than the sum of its proper divisors (11359900898529).

20615436051231 is a wasteful number, since it uses less digits than its factorization.

20615436051231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644363 (or 1644356 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The spelling of 20615436051231 in words is "twenty trillion, six hundred fifteen billion, four hundred thirty-six million, fifty-one thousand, two hundred thirty-one".