20389908 has 48 divisors (see below), whose sum is σ = 59318784. Its totient is φ = 5295840.

The previous prime is 20389903. The next prime is 20389913. The reversal of 20389908 is 80998302.

It is an interprime number because it is at equal distance from previous prime (20389903) and next prime (20389913).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20389903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10110 + ... + 11957.

It is an arithmetic number, because the mean of its divisors is an integer number (1235808).

Almost surely, 2^20389908 is an apocalyptic number.

20389908 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20389908 is an abundant number, since it is smaller than the sum of its proper divisors (38928876).

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

20389908 is a wasteful number, since it uses less digits than its factorization.

20389908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22092 (or 22090 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 20389908 is about 4515.5185748704. The cubic root of 20389908 is about 273.1943764576.

The spelling of 20389908 in words is "twenty million, three hundred eighty-nine thousand, nine hundred eight".