20623643205 has 16 divisors (see below), whose sum is σ = 35997632064.
Its totient is φ = 9999342080.
The previous prime is 20623643153. The next prime is 20623643321. The reversal of 20623643205 is 50234632602.
It is not a de Polignac number, because 20623643205 - 27 = 20623643077 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (33).
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62495724 + ... + 62496053.
It is an arithmetic number, because the mean of its divisors is an integer number (2249852004).
Almost surely, 220623643205 is an apocalyptic number.
It is an amenable number.
20623643205 is a deficient number, since it is larger than the sum of its proper divisors (15373988859).
20623643205 is a wasteful number, since it uses less digits than its factorization.
20623643205 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 124991796.
The product of its (nonzero) digits is 51840, while the sum is 33.
The spelling of 20623643205 in words is "twenty billion, six hundred twenty-three million, six hundred forty-three thousand, two hundred five".