20852864860 has 48 divisors (see below), whose sum is σ = 46306213632. Its totient is φ = 7875187200.

The previous prime is 20852864849. The next prime is 20852864861. The reversal of 20852864860 is 6846825802.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20852864861) 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, 384747 + ... + 435586.

It is an arithmetic number, because the mean of its divisors is an integer number (964712784).

Almost surely, 2^20852864860 is an apocalyptic number.

20852864860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20852864860 is an abundant number, since it is smaller than the sum of its proper divisors (25453348772).

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

20852864860 is a wasteful number, since it uses less digits than its factorization.

20852864860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820414 (or 820412 counting only the distinct ones).

The product of its (nonzero) digits is 1474560, while the sum is 49.

The spelling of 20852864860 in words is "twenty billion, eight hundred fifty-two million, eight hundred sixty-four thousand, eight hundred sixty".