20506473546 has 32 divisors (see below), whose sum is σ = 44504970048. Its totient is φ = 6261515520.

The previous prime is 20506473527. The next prime is 20506473551. The reversal of 20506473546 is 64537460502.

It is a junction number, because it is equal to n+sod(n) for n = 20506473498 and 20506473507.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 993231 + ... + 1013666.

It is an arithmetic number, because the mean of its divisors is an integer number (1390780314).

Almost surely, 2^20506473546 is an apocalyptic number.

20506473546 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20506473546 is an abundant number, since it is smaller than the sum of its proper divisors (23998496502).

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

20506473546 is a wasteful number, since it uses less digits than its factorization.

20506473546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2007046.

The product of its (nonzero) digits is 604800, while the sum is 42.

The spelling of 20506473546 in words is "twenty billion, five hundred six million, four hundred seventy-three thousand, five hundred forty-six".