20672131 has 2 divisors, whose sum is σ = 20672132.
Its totient is φ = 20672130.
The previous prime is 20672123. The next prime is 20672227. The reversal of 20672131 is 13127602.
Adding to 20672131 its reverse (13127602), we get a palindrome (33799733).
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 20672131 - 23 = 20672123 is a prime.
It is a super-2 number, since 2×206721312 = 854674000162322, which contains 22 as substring.
It is not a weakly prime, because it can be changed into another prime (20672231) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10336065 + 10336066.
It is an arithmetic number, because the mean of its divisors is an integer number (10336066).
Almost surely, 220672131 is an apocalyptic number.
20672131 is a deficient number, since it is larger than the sum of its proper divisors (1).
20672131 is an equidigital number, since it uses as much as digits as its factorization.
20672131 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 504, while the sum is 22.
The square root of 20672131 is about 4546.6615224800.
The cubic root of 20672131 is about 274.4490611659.
The spelling of 20672131 in words is "twenty million, six hundred seventy-two thousand, one hundred thirty-one".