20358514643 has 4 divisors (see below), whose sum is σ = 20616217440. Its totient is φ = 20100811848.

The previous prime is 20358514621. The next prime is 20358514667. The reversal of 20358514643 is 34641585302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34641585302 = 2 ⋅17320792651.

It is a cyclic number.

It is not a de Polignac number, because 20358514643 - 2⁸ = 20358514387 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20358514643.

It is not an unprimeable number, because it can be changed into a prime (20358514613) 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, 128851280 + ... + 128851437.

It is an arithmetic number, because the mean of its divisors is an integer number (5154054360).

Almost surely, 2^20358514643 is an apocalyptic number.

20358514643 is a deficient number, since it is larger than the sum of its proper divisors (257702797).

20358514643 is an equidigital number, since it uses as much as digits as its factorization.

20358514643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257702796.

The product of its (nonzero) digits is 345600, while the sum is 41.

The spelling of 20358514643 in words is "twenty billion, three hundred fifty-eight million, five hundred fourteen thousand, six hundred forty-three".