20813366357 has 8 divisors (see below), whose sum is σ = 23789033856. Its totient is φ = 17838281232.

The previous prime is 20813366351. The next prime is 20813366377. The reversal of 20813366357 is 75366331802.

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

It is a cyclic number.

It is not a de Polignac number, because 20813366357 - 2⁴ = 20813366341 is a prime.

It is a super-4 number, since 4×20813366357⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20813366351) 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, 66113 + ... + 214470.

It is an arithmetic number, because the mean of its divisors is an integer number (2973629232).

Almost surely, 2^20813366357 is an apocalyptic number.

It is an amenable number.

20813366357 is a deficient number, since it is larger than the sum of its proper divisors (2975667499).

20813366357 is a wasteful number, since it uses less digits than its factorization.

20813366357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291187.

The product of its (nonzero) digits is 544320, while the sum is 44.

The spelling of 20813366357 in words is "twenty billion, eight hundred thirteen million, three hundred sixty-six thousand, three hundred fifty-seven".