20169513 has 32 divisors (see below), whose sum is σ = 36780800. Its totient is φ = 10637568.

The previous prime is 20169511. The next prime is 20169517. The reversal of 20169513 is 31596102.

It is not a de Polignac number, because 20169513 - 2¹ = 20169511 is a prime.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20169511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1648 + ... + 6561.

It is an arithmetic number, because the mean of its divisors is an integer number (1149400).

Almost surely, 2^20169513 is an apocalyptic number.

It is an amenable number.

20169513 is a deficient number, since it is larger than the sum of its proper divisors (16611287).

20169513 is a wasteful number, since it uses less digits than its factorization.

20169513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8238 (or 8232 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 20169513 is about 4491.0480959348. The cubic root of 20169513 is about 272.2064869860.

The spelling of 20169513 in words is "twenty million, one hundred sixty-nine thousand, five hundred thirteen".