20149511 has 8 divisors (see below), whose sum is σ = 20813760. Its totient is φ = 19495168.

The previous prime is 20149501. The next prime is 20149517. The reversal of 20149511 is 11594102.

It is a happy number.

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 20149511 - 2⁶ = 20149447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20149517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1775 + ... + 6591.

It is an arithmetic number, because the mean of its divisors is an integer number (2601720).

Almost surely, 2^20149511 is an apocalyptic number.

20149511 is a deficient number, since it is larger than the sum of its proper divisors (664249).

20149511 is an equidigital number, since it uses as much as digits as its factorization.

20149511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4953.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 20149511 is about 4488.8206691736. The cubic root of 20149511 is about 272.1164753107.

The spelling of 20149511 in words is "twenty million, one hundred forty-nine thousand, five hundred eleven".