20858731768 has 32 divisors (see below), whose sum is σ = 44752629600. Its totient is φ = 8928387072.

The previous prime is 20858731709. The next prime is 20858731769. The reversal of 20858731768 is 86713785802.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20858731769) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184905 + ... + 275512.

It is an arithmetic number, because the mean of its divisors is an integer number (1398519675).

Almost surely, 2^20858731768 is an apocalyptic number.

20858731768 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20858731768 is an abundant number, since it is smaller than the sum of its proper divisors (23893897832).

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

20858731768 is a wasteful number, since it uses less digits than its factorization.

20858731768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461239 (or 461235 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 55.

The spelling of 20858731768 in words is "twenty billion, eight hundred fifty-eight million, seven hundred thirty-one thousand, seven hundred sixty-eight".