20655742 has 8 divisors (see below), whose sum is σ = 31003632. Its totient is φ = 10321200.

The previous prime is 20655737. The next prime is 20655749. The reversal of 20655742 is 24755602.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20655749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2767 + ... + 6997.

It is an arithmetic number, because the mean of its divisors is an integer number (3875454).

Almost surely, 2^20655742 is an apocalyptic number.

20655742 is a deficient number, since it is larger than the sum of its proper divisors (10347890).

20655742 is a wasteful number, since it uses less digits than its factorization.

20655742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6674.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 20655742 is about 4544.8588536939. The cubic root of 20655742 is about 274.3765136565.

The spelling of 20655742 in words is "twenty million, six hundred fifty-five thousand, seven hundred forty-two".