20430155 has 4 divisors (see below), whose sum is σ = 24516192. Its totient is φ = 16344120.

The previous prime is 20430143. The next prime is 20430167. The reversal of 20430155 is 55103402.

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

It is an interprime number because it is at equal distance from previous prime (20430143) and next prime (20430167).

It is not a de Polignac number, because 20430155 - 2¹⁰ = 20429131 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2043011 + ... + 2043020.

It is an arithmetic number, because the mean of its divisors is an integer number (6129048).

Almost surely, 2^20430155 is an apocalyptic number.

20430155 is a deficient number, since it is larger than the sum of its proper divisors (4086037).

20430155 is an equidigital number, since it uses as much as digits as its factorization.

20430155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4086036.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 20430155 is about 4519.9728981488. The cubic root of 20430155 is about 273.3740082571.

Adding to 20430155 its reverse (55103402), we get a palindrome (75533557).

The spelling of 20430155 in words is "twenty million, four hundred thirty thousand, one hundred fifty-five".