20155730 has 16 divisors (see below), whose sum is σ = 41463360. Its totient is φ = 6910512.

The previous prime is 20155703. The next prime is 20155747. The reversal of 20155730 is 3755102.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20155696 and 20155705.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143900 + ... + 144039.

It is an arithmetic number, because the mean of its divisors is an integer number (2591460).

Almost surely, 2^20155730 is an apocalyptic number.

20155730 is an abundant number, since it is smaller than the sum of its proper divisors (21307630).

20155730 is a wasteful number, since it uses less digits than its factorization.

20155730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287953.

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 20155730 is about 4489.5133366547. The cubic root of 20155730 is about 272.1444680212.

The spelling of 20155730 in words is "twenty million, one hundred fifty-five thousand, seven hundred thirty".