20573438920 has 64 divisors (see below), whose sum is σ = 47910643200. Its totient is φ = 7942717440.

The previous prime is 20573438917. The next prime is 20573438923. The reversal of 20573438920 is 2983437502.

It is an interprime number because it is at equal distance from previous prime (20573438917) and next prime (20573438923).

It is not an unprimeable number, because it can be changed into a prime (20573438923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 448072 + ... + 491848.

It is an arithmetic number, because the mean of its divisors is an integer number (748603800).

Almost surely, 2^20573438920 is an apocalyptic number.

20573438920 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 20573438920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23955321600).

20573438920 is an abundant number, since it is smaller than the sum of its proper divisors (27337204280).

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

20573438920 is a wasteful number, since it uses less digits than its factorization.

20573438920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44198 (or 44194 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 43.

The spelling of 20573438920 in words is "twenty billion, five hundred seventy-three million, four hundred thirty-eight thousand, nine hundred twenty".