20105135245731 has 16 divisors (see below), whose sum is σ = 27085325652000. Its totient is φ = 13264205795328.

The previous prime is 20105135245673. The next prime is 20105135245763. The reversal of 20105135245731 is 13754253150102.

It is not a de Polignac number, because 20105135245731 - 2⁷ = 20105135245603 is a prime.

It is a super-2 number, since 2×20105135245731² (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 20105135245731.

It is not an unprimeable number, because it can be changed into a prime (20105135245771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1030495 + ... + 6424343.

It is an arithmetic number, because the mean of its divisors is an integer number (1692832853250).

Almost surely, 2^{20105135245731} is an apocalyptic number.

20105135245731 is a deficient number, since it is larger than the sum of its proper divisors (6980190406269).

20105135245731 is a wasteful number, since it uses less digits than its factorization.

20105135245731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5406758.

The product of its (nonzero) digits is 126000, while the sum is 39.

Adding to 20105135245731 its reverse (13754253150102), we get a palindrome (33859388395833).

The spelling of 20105135245731 in words is "twenty trillion, one hundred five billion, one hundred thirty-five million, two hundred forty-five thousand, seven hundred thirty-one".