20506030 has 32 divisors (see below), whose sum is σ = 37895040. Its totient is φ = 7987200.

The previous prime is 20506021. The next prime is 20506037. The reversal of 20506030 is 3060502.

It is a junction number, because it is equal to n+sod(n) for n = 20505995 and 20506013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20506037) 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, 79662 + ... + 79918.

It is an arithmetic number, because the mean of its divisors is an integer number (1184220).

Almost surely, 2^20506030 is an apocalyptic number.

20506030 is a deficient number, since it is larger than the sum of its proper divisors (17389010).

20506030 is a wasteful number, since it uses less digits than its factorization.

20506030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444.

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 20506030 is about 4528.3584222100. The cubic root of 20506030 is about 273.7120156078.

Adding to 20506030 its reverse (3060502), we get a palindrome (23566532).

The spelling of 20506030 in words is "twenty million, five hundred six thousand, thirty".