20007988 has 96 divisors (see below), whose sum is σ = 49674240. Its totient is φ = 6791040.

The previous prime is 20007979. The next prime is 20008019. The reversal of 20007988 is 88970002.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75945 + ... + 76207.

It is an arithmetic number, because the mean of its divisors is an integer number (517440).

Almost surely, 2^20007988 is an apocalyptic number.

20007988 is a gapful number since it is divisible by the number (28) 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 20007988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24837120).

20007988 is an abundant number, since it is smaller than the sum of its proper divisors (29666252).

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

20007988 is a wasteful number, since it uses less digits than its factorization.

20007988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317 (or 315 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 20007988 is about 4473.0289513930. The cubic root of 20007988 is about 271.4778947959.

It can be divided in two parts, 20007 and 988, that multiplied together give a square (19766916 = 4446²).

The spelling of 20007988 in words is "twenty million, seven thousand, nine hundred eighty-eight".