20672213 has 4 divisors (see below), whose sum is σ = 20955468. Its totient is φ = 20388960.

The previous prime is 20672131. The next prime is 20672227. The reversal of 20672213 is 31227602.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13823524 + 6848689 = 3718^2 + 2617^2 .

It is a cyclic number.

It is not a de Polignac number, because 20672213 - 2⁸ = 20671957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20672413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141518 + ... + 141663.

It is an arithmetic number, because the mean of its divisors is an integer number (5238867).

Almost surely, 2^20672213 is an apocalyptic number.

It is an amenable number.

20672213 is a deficient number, since it is larger than the sum of its proper divisors (283255).

20672213 is an equidigital number, since it uses as much as digits as its factorization.

20672213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283254.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 20672213 is about 4546.6705400766. The cubic root of 20672213 is about 274.4494240505.

Adding to 20672213 its reverse (31227602), we get a palindrome (51899815).

The spelling of 20672213 in words is "twenty million, six hundred seventy-two thousand, two hundred thirteen".