20858339840 has 160 divisors (see below), whose sum is σ = 56694496320. Its totient is φ = 7295975424.

The previous prime is 20858339833. The next prime is 20858339849. The reversal of 20858339840 is 4893385802.

It is a tau number, because it is divible by the number of its divisors (160).

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20858339849) 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, 615827 + ... + 648813.

It is an arithmetic number, because the mean of its divisors is an integer number (354340602).

Almost surely, 2^20858339840 is an apocalyptic number.

20858339840 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 20858339840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28347248160).

20858339840 is an abundant number, since it is smaller than the sum of its proper divisors (35836156480).

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

20858339840 is a wasteful number, since it uses less digits than its factorization.

20858339840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33042 (or 33026 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 50.

The spelling of 20858339840 in words is "twenty billion, eight hundred fifty-eight million, three hundred thirty-nine thousand, eight hundred forty".