20856473368 has 24 divisors (see below), whose sum is σ = 39607259580. Its totient is φ = 10296209040.

The previous prime is 20856473359. The next prime is 20856473383. The reversal of 20856473368 is 86337465802.

It is a super-4 number, since 4×20856473368⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 158938 + ... + 258793.

Almost surely, 2^20856473368 is an apocalyptic number.

It is an amenable number.

20856473368 is a deficient number, since it is larger than the sum of its proper divisors (18750786212).

20856473368 is an equidigital number, since it uses as much as digits as its factorization.

20856473368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417895 (or 417812 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 52.

The spelling of 20856473368 in words is "twenty billion, eight hundred fifty-six million, four hundred seventy-three thousand, three hundred sixty-eight".