20545345156 has 24 divisors (see below), whose sum is σ = 41160724416. Its totient is φ = 8790140640.

The previous prime is 20545345123. The next prime is 20545345211. The reversal of 20545345156 is 65154354502.

It is a super-2 number, since 2×20545345156² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 608575 + ... + 641446.

It is an arithmetic number, because the mean of its divisors is an integer number (1715030184).

Almost surely, 2^20545345156 is an apocalyptic number.

It is an amenable number.

20545345156 is an abundant number, since it is smaller than the sum of its proper divisors (20615379260).

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

20545345156 is a wasteful number, since it uses less digits than its factorization.

20545345156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250619 (or 1250617 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 40.

Adding to 20545345156 its reverse (65154354502), we get a palindrome (85699699658).

The spelling of 20545345156 in words is "twenty billion, five hundred forty-five million, three hundred forty-five thousand, one hundred fifty-six".