20343855 has 16 divisors (see below), whose sum is σ = 37200384. Its totient is φ = 9300000.

The previous prime is 20343853. The next prime is 20343871. The reversal of 20343855 is 55834302.

It is not a de Polignac number, because 20343855 - 2¹ = 20343853 is a prime.

It is a super-2 number, since 2×20343855² = 827744872522050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20343853) 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, 96771 + ... + 96980.

It is an arithmetic number, because the mean of its divisors is an integer number (2325024).

Almost surely, 2^20343855 is an apocalyptic number.

20343855 is a deficient number, since it is larger than the sum of its proper divisors (16856529).

20343855 is a wasteful number, since it uses less digits than its factorization.

20343855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193766.

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 20343855 is about 4510.4162779061. The cubic root of 20343855 is about 272.9885408922.

The spelling of 20343855 in words is "twenty million, three hundred forty-three thousand, eight hundred fifty-five".