20854044540 has 240 divisors, whose sum is σ = 76506135552. Its totient is φ = 4655677824.

The previous prime is 20854044493. The next prime is 20854044611. The reversal of 20854044540 is 4544045802.

20854044540 is a `hidden beast` number, since 20 + 8 + 54 + 0 + 44 + 540 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20854044495 and 20854044504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 466237 + ... + 509003.

Almost surely, 2^20854044540 is an apocalyptic number.

20854044540 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 20854044540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38253067776).

20854044540 is an abundant number, since it is smaller than the sum of its proper divisors (55652091012).

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

20854044540 is a wasteful number, since it uses less digits than its factorization.

20854044540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42838 (or 42827 counting only the distinct ones).

The product of its (nonzero) digits is 102400, while the sum is 36.

The spelling of 20854044540 in words is "twenty billion, eight hundred fifty-four million, forty-four thousand, five hundred forty".