20155742 has 8 divisors (see below), whose sum is σ = 30729432. Its totient is φ = 9912600.

The previous prime is 20155703. The next prime is 20155747. The reversal of 20155742 is 24755102.

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 (20155747) 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, 82484 + ... + 82727.

It is an arithmetic number, because the mean of its divisors is an integer number (3841179).

Almost surely, 2^20155742 is an apocalyptic number.

20155742 is a deficient number, since it is larger than the sum of its proper divisors (10573690).

20155742 is a wasteful number, since it uses less digits than its factorization.

20155742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165274.

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 20155742 is about 4489.5146731022. The cubic root of 20155742 is about 272.1445220295.

The spelling of 20155742 in words is "twenty million, one hundred fifty-five thousand, seven hundred forty-two".