20531467 has 8 divisors (see below), whose sum is σ = 22529520. Its totient is φ = 18555360.

The previous prime is 20531437. The next prime is 20531477. The reversal of 20531467 is 76413502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20531467 is a prime.

It is a super-2 number, since 2×20531467² = 843082274344178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20531417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3492 + ... + 7297.

It is an arithmetic number, because the mean of its divisors is an integer number (2816190).

Almost surely, 2^20531467 is an apocalyptic number.

20531467 is a deficient number, since it is larger than the sum of its proper divisors (1998053).

20531467 is a wasteful number, since it uses less digits than its factorization.

20531467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10973.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 20531467 is about 4531.1661854317. The cubic root of 20531467 is about 273.8251455123.

Adding to 20531467 its reverse (76413502), we get a palindrome (96944969).

The spelling of 20531467 in words is "twenty million, five hundred thirty-one thousand, four hundred sixty-seven".