20603646534 has 8 divisors (see below), whose sum is σ = 41207293080. Its totient is φ = 6867882176.

The previous prime is 20603646527. The next prime is 20603646551. The reversal of 20603646534 is 43564630602.

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

20603646534 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 20603646492 and 20603646501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1716970539 + ... + 1716970550.

It is an arithmetic number, because the mean of its divisors is an integer number (5150911635).

Almost surely, 2^20603646534 is an apocalyptic number.

20603646534 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20603646534 is a wasteful number, since it uses less digits than its factorization.

20603646534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3433941094.

The product of its (nonzero) digits is 311040, while the sum is 39.

The spelling of 20603646534 in words is "twenty billion, six hundred three million, six hundred forty-six thousand, five hundred thirty-four".