20343155 has 32 divisors (see below), whose sum is σ = 29942784. Its totient is φ = 12963456.

The previous prime is 20343139. The next prime is 20343179. The reversal of 20343155 is 55134302.

It is a cyclic number.

It is not a de Polignac number, because 20343155 - 2⁴ = 20343139 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20343155.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29444 + ... + 30126.

It is an arithmetic number, because the mean of its divisors is an integer number (935712).

Almost surely, 2^20343155 is an apocalyptic number.

20343155 is a deficient number, since it is larger than the sum of its proper divisors (9599629).

20343155 is a wasteful number, since it uses less digits than its factorization.

20343155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 20343155 is about 4510.3386790794. The cubic root of 20343155 is about 272.9854098211.

Adding to 20343155 its reverse (55134302), we get a palindrome (75477457).

The spelling of 20343155 in words is "twenty million, three hundred forty-three thousand, one hundred fifty-five".