20681467 has 8 divisors (see below), whose sum is σ = 21111552. Its totient is φ = 20256000.

The previous prime is 20681459. The next prime is 20681471. The reversal of 20681467 is 76418602.

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

It is a cyclic number.

It is not a de Polignac number, because 20681467 - 2³ = 20681459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20681407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8742 + ... + 10852.

It is an arithmetic number, because the mean of its divisors is an integer number (2638944).

Almost surely, 2^20681467 is an apocalyptic number.

20681467 is a deficient number, since it is larger than the sum of its proper divisors (430085).

20681467 is a wasteful number, since it uses less digits than its factorization.

20681467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2309.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 20681467 is about 4547.6880939660. The cubic root of 20681467 is about 274.4903707404.

The spelling of 20681467 in words is "twenty million, six hundred eighty-one thousand, four hundred sixty-seven".