20401308 has 72 divisors (see below), whose sum is σ = 54221440. Its totient is φ = 6706800.

The previous prime is 20401291. The next prime is 20401321. The reversal of 20401308 is 80310402.

It is a happy number.

It is a super-2 number, since 2×20401308² = 832426736221728, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 135033 + ... + 135183.

Almost surely, 2^20401308 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20401308, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27110720).

20401308 is an abundant number, since it is smaller than the sum of its proper divisors (33820132).

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

20401308 is a wasteful number, since it uses less digits than its factorization.

20401308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 20401308 is about 4516.7807119673. The cubic root of 20401308 is about 273.2452813080.

The spelling of 20401308 in words is "twenty million, four hundred one thousand, three hundred eight".