20021307 has 16 divisors (see below), whose sum is σ = 28258560. Its totient is φ = 12573792.

The previous prime is 20021303. The next prime is 20021311. The reversal of 20021307 is 70312002.

It is an interprime number because it is at equal distance from previous prime (20021303) and next prime (20021311).

It is not a de Polignac number, because 20021307 - 2² = 20021303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20021303) 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, 10338 + ... + 12120.

It is an arithmetic number, because the mean of its divisors is an integer number (1766160).

Almost surely, 2^20021307 is an apocalyptic number.

20021307 is a deficient number, since it is larger than the sum of its proper divisors (8237253).

20021307 is a wasteful number, since it uses less digits than its factorization.

20021307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2002.

The product of its (nonzero) digits is 84, while the sum is 15.

The square root of 20021307 is about 4474.5175158893. The cubic root of 20021307 is about 271.5381209424.

Adding to 20021307 its reverse (70312002), we get a palindrome (90333309).

The spelling of 20021307 in words is "twenty million, twenty-one thousand, three hundred seven".