20045155 has 16 divisors (see below), whose sum is σ = 26105184. Its totient is φ = 14688000.

The previous prime is 20045131. The next prime is 20045161. The reversal of 20045155 is 55154002.

It is a de Polignac number, because none of the positive numbers 2^k-20045155 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7780 + ... + 10030.

It is an arithmetic number, because the mean of its divisors is an integer number (1631574).

Almost surely, 2^20045155 is an apocalyptic number.

20045155 is a deficient number, since it is larger than the sum of its proper divisors (6060029).

20045155 is a wasteful number, since it uses less digits than its factorization.

20045155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2406.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 20045155 is about 4477.1815911352. The cubic root of 20045155 is about 271.6458906582.

Adding to 20045155 its reverse (55154002), we get a palindrome (75199157).

The spelling of 20045155 in words is "twenty million, forty-five thousand, one hundred fifty-five".