20144861 has 8 divisors (see below), whose sum is σ = 22278144. Its totient is φ = 18061920.

The previous prime is 20144857. The next prime is 20144869. The reversal of 20144861 is 16844102.

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 20144861 - 2² = 20144857 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 20144861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20144869) 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, 11741 + ... + 13346.

It is an arithmetic number, because the mean of its divisors is an integer number (2784768).

Almost surely, 2^20144861 is an apocalyptic number.

It is an amenable number.

20144861 is a deficient number, since it is larger than the sum of its proper divisors (2133283).

20144861 is a wasteful number, since it uses less digits than its factorization.

20144861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25171.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 20144861 is about 4488.3026858714. The cubic root of 20144861 is about 272.0955411557.

Adding to 20144861 its reverse (16844102), we get a palindrome (36988963).

The spelling of 20144861 in words is "twenty million, one hundred forty-four thousand, eight hundred sixty-one".