20399148 has 144 divisors (see below), whose sum is σ = 66734080. Its totient is φ = 5274720.

The previous prime is 20399129. The next prime is 20399177. The reversal of 20399148 is 84199302.

It is a super-2 number, since 2×20399148² = 832250478251808, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 91365 + ... + 91587.

Almost surely, 2^20399148 is an apocalyptic number.

20399148 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 20399148, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33367040).

20399148 is an abundant number, since it is smaller than the sum of its proper divisors (46334932).

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

20399148 is a wasteful number, since it uses less digits than its factorization.

20399148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265 (or 246 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 20399148 is about 4516.5415972844. The cubic root of 20399148 is about 273.2356376349.

The spelling of 20399148 in words is "twenty million, three hundred ninety-nine thousand, one hundred forty-eight".