20149308 has 18 divisors (see below), whose sum is σ = 50933064. Its totient is φ = 6716424.

The previous prime is 20149271. The next prime is 20149309. The reversal of 20149308 is 80394102.

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

It is a super-2 number, since 2×20149308² = 811989225757728, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20149309) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 279816 + ... + 279887.

Almost surely, 2^20149308 is an apocalyptic number.

It is an amenable number.

20149308 is an abundant number, since it is smaller than the sum of its proper divisors (30783756).

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

20149308 is a wasteful number, since it uses less digits than its factorization.

20149308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559713 (or 559708 counting only the distinct ones).

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

The square root of 20149308 is about 4488.7980573869. The cubic root of 20149308 is about 272.1155614783.

The spelling of 20149308 in words is "twenty million, one hundred forty-nine thousand, three hundred eight".