20912709418643 has 8 divisors (see below), whose sum is σ = 24013510613760. Its totient is φ = 17840226043080.

The previous prime is 20912709418613. The next prime is 20912709418651. The reversal of 20912709418643 is 34681490721902.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-20912709418643 is a prime.

It is a super-2 number, since 2×20912709418643² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20912709418613) 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, 7079453303 + ... + 7079456256.

It is an arithmetic number, because the mean of its divisors is an integer number (3001688826720).

Almost surely, 2^{20912709418643} is an apocalyptic number.

20912709418643 is a deficient number, since it is larger than the sum of its proper divisors (3100801195117).

20912709418643 is a wasteful number, since it uses less digits than its factorization.

20912709418643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14158909777.

The product of its (nonzero) digits is 5225472, while the sum is 56.

The spelling of 20912709418643 in words is "twenty trillion, nine hundred twelve billion, seven hundred nine million, four hundred eighteen thousand, six hundred forty-three".