20847221900 has 36 divisors (see below), whose sum is σ = 45441383232. Its totient is φ = 8301485760.

The previous prime is 20847221887. The next prime is 20847221951. The reversal of 20847221900 is 912274802.

It is a super-2 number, since 2×20847221900² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 445127 + ... + 489726.

Almost surely, 2^20847221900 is an apocalyptic number.

20847221900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20847221900 is an abundant number, since it is smaller than the sum of its proper divisors (24594161332).

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

20847221900 is a wasteful number, since it uses less digits than its factorization.

20847221900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935090 (or 935083 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The spelling of 20847221900 in words is "twenty billion, eight hundred forty-seven million, two hundred twenty-one thousand, nine hundred".