20914861 has 8 divisors (see below), whose sum is σ = 22859424. Its totient is φ = 18977520.

The previous prime is 20914837. The next prime is 20914867. The reversal of 20914861 is 16841902.

It is a happy number.

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 20914861 - 2⁹ = 20914349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20914867) 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, 5595 + ... + 8551.

It is an arithmetic number, because the mean of its divisors is an integer number (2857428).

Almost surely, 2^20914861 is an apocalyptic number.

It is an amenable number.

20914861 is a deficient number, since it is larger than the sum of its proper divisors (1944563).

20914861 is a wasteful number, since it uses less digits than its factorization.

20914861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3611.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 20914861 is about 4573.2768339562. The cubic root of 20914861 is about 275.5190681167.

The spelling of 20914861 in words is "twenty million, nine hundred fourteen thousand, eight hundred sixty-one".