20450155 has 16 divisors (see below), whose sum is σ = 27396864. Its totient is φ = 14525280.

The previous prime is 20450149. The next prime is 20450207. The reversal of 20450155 is 55105402.

It is not a de Polignac number, because 20450155 - 2¹⁵ = 20417387 is a prime.

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, 1959 + ... + 6688.

It is an arithmetic number, because the mean of its divisors is an integer number (1712304).

Almost surely, 2^20450155 is an apocalyptic number.

20450155 is a deficient number, since it is larger than the sum of its proper divisors (6946709).

20450155 is a wasteful number, since it uses less digits than its factorization.

20450155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8706.

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

The square root of 20450155 is about 4522.1847596046. The cubic root of 20450155 is about 273.4631852117.

Adding to 20450155 its reverse (55105402), we get a palindrome (75555557).

The spelling of 20450155 in words is "twenty million, four hundred fifty thousand, one hundred fifty-five".