20151530 has 32 divisors (see below), whose sum is σ = 41610240. Its totient is φ = 6883200.

The previous prime is 20151529. The next prime is 20151539. The reversal of 20151530 is 3515102.

It is a super-2 number, since 2×20151530² = 812168322681800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20151499 and 20151508.

It is not an unprimeable number, because it can be changed into a prime (20151539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33230 + ... + 33830.

It is an arithmetic number, because the mean of its divisors is an integer number (1300320).

Almost surely, 2^20151530 is an apocalyptic number.

20151530 is an abundant number, since it is smaller than the sum of its proper divisors (21458710).

20151530 is a wasteful number, since it uses less digits than its factorization.

20151530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 20151530 is about 4489.0455555719. The cubic root of 20151530 is about 272.1255637829.

Adding to 20151530 its reverse (3515102), we get a palindrome (23666632).

The spelling of 20151530 in words is "twenty million, one hundred fifty-one thousand, five hundred thirty".