20573556040 has 64 divisors (see below), whose sum is σ = 46972224000. Its totient is φ = 8108655360.

The previous prime is 20573556011. The next prime is 20573556053. The reversal of 20573556040 is 4065537502.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1602045 + ... + 1614835.

It is an arithmetic number, because the mean of its divisors is an integer number (733941000).

Almost surely, 2^20573556040 is an apocalyptic number.

20573556040 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 20573556040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23486112000).

20573556040 is an abundant number, since it is smaller than the sum of its proper divisors (26398667960).

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

20573556040 is a wasteful number, since it uses less digits than its factorization.

20573556040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13390 (or 13386 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 37.

The spelling of 20573556040 in words is "twenty billion, five hundred seventy-three million, five hundred fifty-six thousand, forty".