20515030 has 16 divisors (see below), whose sum is σ = 37713600. Its totient is φ = 8031232.

The previous prime is 20515013. The next prime is 20515051. The reversal of 20515030 is 3051502.

It is a junction number, because it is equal to n+sod(n) for n = 20514995 and 20515013.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21355 + ... + 22294.

It is an arithmetic number, because the mean of its divisors is an integer number (2357100).

Almost surely, 2^20515030 is an apocalyptic number.

20515030 is a deficient number, since it is larger than the sum of its proper divisors (17198570).

20515030 is a wasteful number, since it uses less digits than its factorization.

20515030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43703.

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 20515030 is about 4529.3520507905. The cubic root of 20515030 is about 273.7520533891.

Adding to 20515030 its reverse (3051502), we get a palindrome (23566532).

The spelling of 20515030 in words is "twenty million, five hundred fifteen thousand, thirty".