20843859261947 has 16 divisors (see below), whose sum is σ = 23201082347520. Its totient is φ = 18643726843200.

The previous prime is 20843859261941. The next prime is 20843859261971. The reversal of 20843859261947 is 74916295834802.

It is a cyclic number.

It is not a de Polignac number, because 20843859261947 - 2¹⁶ = 20843859196411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20843859261941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 431543603 + ... + 431591900.

It is an arithmetic number, because the mean of its divisors is an integer number (1450067646720).

It is a 1-persistent number, because it is pandigital, but 2⋅20843859261947 = 41687718523894 is not.

Almost surely, 2^{20843859261947} is an apocalyptic number.

20843859261947 is a deficient number, since it is larger than the sum of its proper divisors (2357223085573).

20843859261947 is a wasteful number, since it uses less digits than its factorization.

20843859261947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863135594.

The product of its (nonzero) digits is 209018880, while the sum is 68.

The spelling of 20843859261947 in words is "twenty trillion, eight hundred forty-three billion, eight hundred fifty-nine million, two hundred sixty-one thousand, nine hundred forty-seven".