20071155 has 16 divisors (see below), whose sum is σ = 34584480. Its totient is φ = 9881088.

The previous prime is 20071147. The next prime is 20071159. The reversal of 20071155 is 55117002.

It is not a de Polignac number, because 20071155 - 2³ = 20071147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20071159) 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, 51270 + ... + 51659.

It is an arithmetic number, because the mean of its divisors is an integer number (2161530).

Almost surely, 2^20071155 is an apocalyptic number.

20071155 is a deficient number, since it is larger than the sum of its proper divisors (14513325).

20071155 is a wasteful number, since it uses less digits than its factorization.

20071155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102950.

The product of its (nonzero) digits is 350, while the sum is 21.

The square root of 20071155 is about 4480.0842626004. The cubic root of 20071155 is about 271.7632879662.

Adding to 20071155 its reverse (55117002), we get a palindrome (75188157).

The spelling of 20071155 in words is "twenty million, seventy-one thousand, one hundred fifty-five".