20420530 has 16 divisors (see below), whose sum is σ = 39584664. Its totient is φ = 7539840.

The previous prime is 20420503. The next prime is 20420531. The reversal of 20420530 is 3502402.

It can be written as a sum of positive squares in 4 ways, for example, as 6365529 + 14055001 = 2523^2 + 3749^2 .

It is not an unprimeable number, because it can be changed into a prime (20420531) 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, 78411 + ... + 78670.

Almost surely, 2^20420530 is an apocalyptic number.

20420530 is a deficient number, since it is larger than the sum of its proper divisors (19164134).

20420530 is a wasteful number, since it uses less digits than its factorization.

20420530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157101.

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

The square root of 20420530 is about 4518.9080539440. The cubic root of 20420530 is about 273.3310711030.

Adding to 20420530 its reverse (3502402), we get a palindrome (23922932).

The spelling of 20420530 in words is "twenty million, four hundred twenty thousand, five hundred thirty".