20847639300 has 144 divisors (see below), whose sum is σ = 63805499520. Its totient is φ = 5244687360.

The previous prime is 20847639299. The next prime is 20847639301. The reversal of 20847639300 is 393674802.

It is an interprime number because it is at equal distance from previous prime (20847639299) and next prime (20847639301).

It is not an unprimeable number, because it can be changed into a prime (20847639301) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 483006 + ... + 524394.

Almost surely, 2^20847639300 is an apocalyptic number.

20847639300 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 20847639300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31902749760).

20847639300 is an abundant number, since it is smaller than the sum of its proper divisors (42957860220).

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

20847639300 is a wasteful number, since it uses less digits than its factorization.

20847639300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41502 (or 41495 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 42.

The spelling of 20847639300 in words is "twenty billion, eight hundred forty-seven million, six hundred thirty-nine thousand, three hundred".