20661842 has 8 divisors (see below), whose sum is σ = 31132416. Its totient is φ = 10284372.

The previous prime is 20661821. The next prime is 20661857. The reversal of 20661842 is 24816602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22718 + ... + 23609.

It is an arithmetic number, because the mean of its divisors is an integer number (3891552).

Almost surely, 2^20661842 is an apocalyptic number.

20661842 is a deficient number, since it is larger than the sum of its proper divisors (10470574).

20661842 is a wasteful number, since it uses less digits than its factorization.

20661842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46552.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 20661842 is about 4545.5298921028. The cubic root of 20661842 is about 274.4035203842.

The spelling of 20661842 in words is "twenty million, six hundred sixty-one thousand, eight hundred forty-two".