20378988 has 144 divisors (see below), whose sum is σ = 64157184. Its totient is φ = 5322240.

The previous prime is 20378957. The next prime is 20378999. The reversal of 20378988 is 88987302.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 286993 + ... + 287063.

It is an arithmetic number, because the mean of its divisors is an integer number (445536).

Almost surely, 2^20378988 is an apocalyptic number.

20378988 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 20378988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32078592).

20378988 is an abundant number, since it is smaller than the sum of its proper divisors (43778196).

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

20378988 is a wasteful number, since it uses less digits than its factorization.

20378988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 20378988 is about 4514.3092494866. The cubic root of 20378988 is about 273.1455971739.

It can be divided in two parts, 2037 and 8988, that added together give a square (11025 = 105²).

The spelling of 20378988 in words is "twenty million, three hundred seventy-eight thousand, nine hundred eighty-eight".