20147535 has 20 divisors (see below), whose sum is σ = 36117048. Its totient is φ = 10745136.

The previous prime is 20147509. The next prime is 20147539. The reversal of 20147535 is 53574102.

It is a happy number.

It is not a de Polignac number, because 20147535 - 2¹¹ = 20145487 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 20147499 and 20147508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20147539) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 24469 + ... + 25278.

Almost surely, 2^20147535 is an apocalyptic number.

20147535 is a deficient number, since it is larger than the sum of its proper divisors (15969513).

20147535 is an equidigital number, since it uses as much as digits as its factorization.

20147535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49764 (or 49755 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 20147535 is about 4488.6005614222. The cubic root of 20147535 is about 272.1075798139.

The spelling of 20147535 in words is "twenty million, one hundred forty-seven thousand, five hundred thirty-five".