20413908 has 18 divisors (see below), whose sum is σ = 51601914. Its totient is φ = 6804624.

The previous prime is 20413907. The next prime is 20413909. The reversal of 20413908 is 80931402.

It is an interprime number because it is at equal distance from previous prime (20413907) and next prime (20413909).

It can be written as a sum of positive squares in only one way, i.e., 18558864 + 1855044 = 4308^2 + 1362^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20413901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 283491 + ... + 283562.

It is an arithmetic number, because the mean of its divisors is an integer number (2866773).

Almost surely, 2^20413908 is an apocalyptic number.

It is an amenable number.

20413908 is an abundant number, since it is smaller than the sum of its proper divisors (31188006).

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

20413908 is a wasteful number, since it uses less digits than its factorization.

20413908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567063 (or 567058 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20413908 is about 4518.1752954041. The cubic root of 20413908 is about 273.3015225059.

It can be divided in two parts, 20413 and 908, that added together give a triangular number (21321 = T₂₀₆).

The spelling of 20413908 in words is "twenty million, four hundred thirteen thousand, nine hundred eight".