20430502 has 4 divisors (see below), whose sum is σ = 30645756. Its totient is φ = 10215250.

The previous prime is 20430499. The next prime is 20430503. The reversal of 20430502 is 20503402.

It is a semiprime because it is the product of two primes.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 5107624 + ... + 5107627.

It is an arithmetic number, because the mean of its divisors is an integer number (7661439).

Almost surely, 2^20430502 is an apocalyptic number.

20430502 is a deficient number, since it is larger than the sum of its proper divisors (10215254).

20430502 is a wasteful number, since it uses less digits than its factorization.

20430502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10215253.

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 20430502 is about 4520.0112831718. The cubic root of 20430502 is about 273.3755559733.

Adding to 20430502 its reverse (20503402), we get a palindrome (40933904).

Subtracting 20430502 from its reverse (20503402), we obtain a square (72900 = 270²).

The spelling of 20430502 in words is "twenty million, four hundred thirty thousand, five hundred two".