20342861 has 16 divisors (see below), whose sum is σ = 25468800. Its totient is φ = 15785280.

The previous prime is 20342807. The next prime is 20342873. The reversal of 20342861 is 16824302.

It is a de Polignac number, because none of the positive numbers 2^k-20342861 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20342861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20342801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26495 + ... + 27251.

It is an arithmetic number, because the mean of its divisors is an integer number (1591800).

Almost surely, 2^20342861 is an apocalyptic number.

It is an amenable number.

20342861 is a deficient number, since it is larger than the sum of its proper divisors (5125939).

20342861 is a wasteful number, since it uses less digits than its factorization.

20342861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 20342861 is about 4510.3060871741. The cubic root of 20342861 is about 272.9840947498.

The spelling of 20342861 in words is "twenty million, three hundred forty-two thousand, eight hundred sixty-one".