20847988 has 24 divisors (see below), whose sum is σ = 42322112. Its totient is φ = 8800704.

The previous prime is 20847979. The next prime is 20848007. The reversal of 20847988 is 88974802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3681 + ... + 7432.

Almost surely, 2^20847988 is an apocalyptic number.

20847988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20847988 is an abundant number, since it is smaller than the sum of its proper divisors (21474124).

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

20847988 is a wasteful number, since it uses less digits than its factorization.

20847988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11191 (or 11189 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 46.

The square root of 20847988 is about 4565.9597019685. The cubic root of 20847988 is about 275.2251071435.

The spelling of 20847988 in words is "twenty million, eight hundred forty-seven thousand, nine hundred eighty-eight".