20351631604242 has 64 divisors (see below), whose sum is σ = 41336868537216. Its totient is φ = 6678856704000.

The previous prime is 20351631604223. The next prime is 20351631604243. The reversal of 20351631604242 is 24240613615302.

It is a self number, because there is not a number n which added to its sum of digits gives 20351631604242.

It is not an unprimeable number, because it can be changed into a prime (20351631604243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 623635558 + ... + 623668190.

It is an arithmetic number, because the mean of its divisors is an integer number (645888570894).

Almost surely, 2^{20351631604242} is an apocalyptic number.

20351631604242 is an abundant number, since it is smaller than the sum of its proper divisors (20985236932974).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20351631604242 is a wasteful number, since it uses less digits than its factorization.

20351631604242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37035.

The product of its (nonzero) digits is 207360, while the sum is 39.

The spelling of 20351631604242 in words is "twenty trillion, three hundred fifty-one billion, six hundred thirty-one million, six hundred four thousand, two hundred forty-two".