20343149 has 4 divisors (see below), whose sum is σ = 20727036. Its totient is φ = 19959264.

The previous prime is 20343139. The next prime is 20343179. The reversal of 20343149 is 94134302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6786025 + 13557124 = 2605^2 + 3682^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20343149 is a prime.

It is a super-2 number, since 2×20343149² = 827687422472402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20343139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191864 + ... + 191969.

It is an arithmetic number, because the mean of its divisors is an integer number (5181759).

Almost surely, 2^20343149 is an apocalyptic number.

It is an amenable number.

20343149 is a deficient number, since it is larger than the sum of its proper divisors (383887).

20343149 is an equidigital number, since it uses as much as digits as its factorization.

20343149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383886.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 20343149 is about 4510.3380139409. The cubic root of 20343149 is about 272.9853829830.

The spelling of 20343149 in words is "twenty million, three hundred forty-three thousand, one hundred forty-nine".