20356435563 has 8 divisors (see below), whose sum is σ = 27163650000. Its totient is φ = 13560089088.

The previous prime is 20356435553. The next prime is 20356435571. The reversal of 20356435563 is 36553465302.

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

It is not a de Polignac number, because 20356435563 - 2⁹ = 20356435051 is a prime.

It is a super-2 number, since 2×20356435563² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20356435553) 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, 2712618 + ... + 2720111.

It is an arithmetic number, because the mean of its divisors is an integer number (3395456250).

Almost surely, 2^20356435563 is an apocalyptic number.

20356435563 is a deficient number, since it is larger than the sum of its proper divisors (6807214437).

20356435563 is a wasteful number, since it uses less digits than its factorization.

20356435563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5433981.

The product of its (nonzero) digits is 972000, while the sum is 42.

The spelling of 20356435563 in words is "twenty billion, three hundred fifty-six million, four hundred thirty-five thousand, five hundred sixty-three".