20412971 has 8 divisors (see below), whose sum is σ = 21838320. Its totient is φ = 19012608.

The previous prime is 20412967. The next prime is 20412991. The reversal of 20412971 is 17921402.

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 20412971 - 2² = 20412967 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20412971.

It is not an unprimeable number, because it can be changed into a prime (20412991) 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, 4541 + ... + 7838.

It is an arithmetic number, because the mean of its divisors is an integer number (2729790).

Almost surely, 2^20412971 is an apocalyptic number.

20412971 is a deficient number, since it is larger than the sum of its proper divisors (1425349).

20412971 is a wasteful number, since it uses less digits than its factorization.

20412971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12493.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 20412971 is about 4518.0716019116. The cubic root of 20412971 is about 273.2973409214.

The spelling of 20412971 in words is "twenty million, four hundred twelve thousand, nine hundred seventy-one".