20313506 has 4 divisors (see below), whose sum is σ = 30470262. Its totient is φ = 10156752.

The previous prime is 20313493. The next prime is 20313509. The reversal of 20313506 is 60531302.

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

It can be written as a sum of positive squares in only one way, i.e., 19439281 + 874225 = 4409^2 + 935^2 .

It is not an unprimeable number, because it can be changed into a prime (20313509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5078375 + ... + 5078378.

Almost surely, 2^20313506 is an apocalyptic number.

20313506 is a deficient number, since it is larger than the sum of its proper divisors (10156756).

20313506 is a wasteful number, since it uses less digits than its factorization.

20313506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10156755.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 20313506 is about 4507.0506986277. The cubic root of 20313506 is about 272.8527250652.

Adding to 20313506 its reverse (60531302), we get a palindrome (80844808).

The spelling of 20313506 in words is "twenty million, three hundred thirteen thousand, five hundred six".