20149505 has 8 divisors (see below), whose sum is σ = 25601832. Its totient is φ = 15171328.

The previous prime is 20149501. The next prime is 20149517. The reversal of 20149505 is 50594102.

It can be written as a sum of positive squares in 4 ways, for example, as 3568321 + 16581184 = 1889^2 + 4072^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20149505 - 2² = 20149501 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20149501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118442 + ... + 118611.

It is an arithmetic number, because the mean of its divisors is an integer number (3200229).

Almost surely, 2^20149505 is an apocalyptic number.

It is an amenable number.

20149505 is a deficient number, since it is larger than the sum of its proper divisors (5452327).

20149505 is a wasteful number, since it uses less digits than its factorization.

20149505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237075.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 20149505 is about 4488.8200008465. The cubic root of 20149505 is about 272.1164483009.

The spelling of 20149505 in words is "twenty million, one hundred forty-nine thousand, five hundred five".