20847423 has 8 divisors (see below), whose sum is σ = 29431728. Its totient is φ = 13080704.

The previous prime is 20847419. The next prime is 20847443. The reversal of 20847423 is 32474802.

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 20847423 - 2² = 20847419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20847403) 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, 204336 + ... + 204437.

It is an arithmetic number, because the mean of its divisors is an integer number (3678966).

Almost surely, 2^20847423 is an apocalyptic number.

20847423 is a deficient number, since it is larger than the sum of its proper divisors (8584305).

20847423 is a wasteful number, since it uses less digits than its factorization.

20847423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408793.

The product of its (nonzero) digits is 10752, while the sum is 30.

The square root of 20847423 is about 4565.8978306572. The cubic root of 20847423 is about 275.2226208350. Note that the first 3 decimals are identical.

The spelling of 20847423 in words is "twenty million, eight hundred forty-seven thousand, four hundred twenty-three".