20465155 has 16 divisors (see below), whose sum is σ = 25894080. Its totient is φ = 15503488.

The previous prime is 20465149. The next prime is 20465189. The reversal of 20465155 is 55156402.

It is a cyclic number.

It is not a de Polignac number, because 20465155 - 2⁹ = 20464643 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, 6354 + ... + 9016.

It is an arithmetic number, because the mean of its divisors is an integer number (1618380).

Almost surely, 2^20465155 is an apocalyptic number.

20465155 is a deficient number, since it is larger than the sum of its proper divisors (5428925).

20465155 is a wasteful number, since it uses less digits than its factorization.

20465155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2750.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 20465155 is about 4523.8429459918. The cubic root of 20465155 is about 273.5300297788.

The spelling of 20465155 in words is "twenty million, four hundred sixty-five thousand, one hundred fifty-five".