20430506 has 16 divisors (see below), whose sum is σ = 31242240. Its totient is φ = 10018320.

The previous prime is 20430503. The next prime is 20430517. The reversal of 20430506 is 60503402.

It is not an unprimeable number, because it can be changed into a prime (20430503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29840 + ... + 30516.

It is an arithmetic number, because the mean of its divisors is an integer number (1952640).

Almost surely, 2^20430506 is an apocalyptic number.

20430506 is a deficient number, since it is larger than the sum of its proper divisors (10811734).

20430506 is a wasteful number, since it uses less digits than its factorization.

20430506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20430506 is about 4520.0117256485. The cubic root of 20430506 is about 273.3755738143.

Adding to 20430506 its reverse (60503402), we get a palindrome (80933908).

The spelling of 20430506 in words is "twenty million, four hundred thirty thousand, five hundred six".