20843992707 has 4 divisors (see below), whose sum is σ = 27791990280. Its totient is φ = 13895995136.

The previous prime is 20843992681. The next prime is 20843992717. The reversal of 20843992707 is 70729934802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20843992707 - 2²² = 20839798403 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20843992707.

It is not an unprimeable number, because it can be changed into a prime (20843992717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3473998782 + ... + 3473998787.

It is an arithmetic number, because the mean of its divisors is an integer number (6947997570).

Almost surely, 2^20843992707 is an apocalyptic number.

20843992707 is a deficient number, since it is larger than the sum of its proper divisors (6947997573).

20843992707 is an equidigital number, since it uses as much as digits as its factorization.

20843992707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6947997572.

The product of its (nonzero) digits is 1524096, while the sum is 51.

The spelling of 20843992707 in words is "twenty billion, eight hundred forty-three million, nine hundred ninety-two thousand, seven hundred seven".