20349308 has 36 divisors (see below), whose sum is σ = 42325920. Its totient is φ = 8535576.

The previous prime is 20349293. The next prime is 20349347. The reversal of 20349308 is 80394302.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 432941 + ... + 432987.

It is an arithmetic number, because the mean of its divisors is an integer number (1175720).

Almost surely, 2^20349308 is an apocalyptic number.

20349308 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 20349308, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21162960).

20349308 is an abundant number, since it is smaller than the sum of its proper divisors (21976612).

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

20349308 is an frugal number, since it uses more digits than its factorization.

20349308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 56 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 20349308 is about 4511.0207270639. The cubic root of 20349308 is about 273.0129294775.

The spelling of 20349308 in words is "twenty million, three hundred forty-nine thousand, three hundred eight".