20540894100 has 144 divisors (see below), whose sum is σ = 62338176768. Its totient is φ = 5216002560.

The previous prime is 20540894093. The next prime is 20540894149. The reversal of 20540894100 is 149804502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 502014 + ... + 541386.

Almost surely, 2^20540894100 is an apocalyptic number.

20540894100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20540894100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31169088384).

20540894100 is an abundant number, since it is smaller than the sum of its proper divisors (41797282668).

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

20540894100 is a wasteful number, since it uses less digits than its factorization.

20540894100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39474 (or 39467 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The spelling of 20540894100 in words is "twenty billion, five hundred forty million, eight hundred ninety-four thousand, one hundred".