20145511 has 8 divisors (see below), whose sum is σ = 20490624. Its totient is φ = 19803000.

The previous prime is 20145509. The next prime is 20145547. The reversal of 20145511 is 11554102.

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 20145511 - 2¹ = 20145509 is a prime.

It is a super-2 number, since 2×20145511² = 811683226902242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20145551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20350 + ... + 21316.

It is an arithmetic number, because the mean of its divisors is an integer number (2561328).

Almost surely, 2^20145511 is an apocalyptic number.

20145511 is a deficient number, since it is larger than the sum of its proper divisors (345113).

20145511 is an equidigital number, since it uses as much as digits as its factorization.

20145511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 20145511 is about 4488.3750957334. The cubic root of 20145511 is about 272.0984676291.

Adding to 20145511 its reverse (11554102), we get a palindrome (31699613).

The spelling of 20145511 in words is "twenty million, one hundred forty-five thousand, five hundred eleven".