20547533636 has 24 divisors (see below), whose sum is σ = 41289842496. Its totient is φ = 8764348320.

The previous prime is 20547533561. The next prime is 20547533659. The reversal of 20547533636 is 63633574502.

It is a super-2 number, since 2×20547533636² (a number of 21 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 1733051 + ... + 1744866.

It is an arithmetic number, because the mean of its divisors is an integer number (1720410104).

Almost surely, 2^20547533636 is an apocalyptic number.

It is an amenable number.

20547533636 is an abundant number, since it is smaller than the sum of its proper divisors (20742308860).

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

20547533636 is a wasteful number, since it uses less digits than its factorization.

20547533636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3478139 (or 3478137 counting only the distinct ones).

The product of its (nonzero) digits is 1360800, while the sum is 44.

The spelling of 20547533636 in words is "twenty billion, five hundred forty-seven million, five hundred thirty-three thousand, six hundred thirty-six".