20864473 has 8 divisors (see below), whose sum is σ = 24882048. Its totient is φ = 17106144.

The previous prime is 20864429. The next prime is 20864477. The reversal of 20864473 is 37446802.

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-20864473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20864477) 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, 64636 + ... + 64957.

It is an arithmetic number, because the mean of its divisors is an integer number (3110256).

Almost surely, 2^20864473 is an apocalyptic number.

20864473 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20864473 is a deficient number, since it is larger than the sum of its proper divisors (4017575).

20864473 is a wasteful number, since it uses less digits than its factorization.

20864473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129623.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 20864473 is about 4567.7645517255. The cubic root of 20864473 is about 275.2976303778.

The spelling of 20864473 in words is "twenty million, eight hundred sixty-four thousand, four hundred seventy-three".