20148309 has 12 divisors (see below), whose sum is σ = 29513952. Its totient is φ = 13242600.

The previous prime is 20148269. The next prime is 20148329. The reversal of 20148309 is 90384102.

It is not a de Polignac number, because 20148309 - 2⁸ = 20148053 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20148329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15127 + ... + 16404.

It is an arithmetic number, because the mean of its divisors is an integer number (2459496).

Almost surely, 2^20148309 is an apocalyptic number.

It is an amenable number.

20148309 is a deficient number, since it is larger than the sum of its proper divisors (9365643).

20148309 is a wasteful number, since it uses less digits than its factorization.

20148309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31608 (or 31605 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20148309 is about 4488.6867790034. The cubic root of 20148309 is about 272.1110642529. Note that the first 3 decimals are identical.

The spelling of 20148309 in words is "twenty million, one hundred forty-eight thousand, three hundred nine".