20640245381286 has 8 divisors (see below), whose sum is σ = 41280490762584. Its totient is φ = 6880081793760.

The previous prime is 20640245381279. The next prime is 20640245381447. The reversal of 20640245381286 is 68218354204602.

It is a sphenic number, since it is the product of 3 distinct primes.

20640245381286 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1720020448435 + ... + 1720020448446.

It is an arithmetic number, because the mean of its divisors is an integer number (5160061345323).

Almost surely, 2^{20640245381286} is an apocalyptic number.

20640245381286 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20640245381286 is a wasteful number, since it uses less digits than its factorization.

20640245381286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3440040896886.

The product of its (nonzero) digits is 4423680, while the sum is 51.

Adding to 20640245381286 its reverse (68218354204602), we get a palindrome (88858599585888).

The spelling of 20640245381286 in words is "twenty trillion, six hundred forty billion, two hundred forty-five million, three hundred eighty-one thousand, two hundred eighty-six".