20901724540 has 24 divisors (see below), whose sum is σ = 44303846832. Its totient is φ = 8282551680.

The previous prime is 20901724537. The next prime is 20901724579. The reversal of 20901724540 is 4542710902.

It is a junction number, because it is equal to n+sod(n) for n = 20901724496 and 20901724505.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4881441 + ... + 4885720.

It is an arithmetic number, because the mean of its divisors is an integer number (1845993618).

Almost surely, 2^20901724540 is an apocalyptic number.

20901724540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20901724540 is an abundant number, since it is smaller than the sum of its proper divisors (23402122292).

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

20901724540 is a wasteful number, since it uses less digits than its factorization.

20901724540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9767277 (or 9767275 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 20901724540 in words is "twenty billion, nine hundred one million, seven hundred twenty-four thousand, five hundred forty".