20845843506 has 64 divisors (see below), whose sum is σ = 49250384640. Its totient is φ = 6521074560.

The previous prime is 20845843433. The next prime is 20845843511. The reversal of 20845843506 is 60534854802.

20845843506 is a `hidden beast` number, since 20 + 8 + 45 + 84 + 3 + 506 = 666.

It is a super-3 number, since 3×20845843506³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92515 + ... + 224166.

It is an arithmetic number, because the mean of its divisors is an integer number (769537260).

Almost surely, 2^20845843506 is an apocalyptic number.

20845843506 is an abundant number, since it is smaller than the sum of its proper divisors (28404541134).

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

20845843506 is a wasteful number, since it uses less digits than its factorization.

20845843506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316768 (or 316762 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 45.

The spelling of 20845843506 in words is "twenty billion, eight hundred forty-five million, eight hundred forty-three thousand, five hundred six".