20355742 has 16 divisors (see below), whose sum is σ = 33642864. Its totient is φ = 9160000.

The previous prime is 20355733. The next prime is 20355757. The reversal of 20355742 is 24755302.

It is a self number, because there is not a number n which added to its sum of digits gives 20355742.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2359 + ... + 6802.

It is an arithmetic number, because the mean of its divisors is an integer number (2102679).

Almost surely, 2^20355742 is an apocalyptic number.

20355742 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20355742 is a deficient number, since it is larger than the sum of its proper divisors (13287122).

20355742 is a wasteful number, since it uses less digits than its factorization.

20355742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9275.

The product of its (nonzero) digits is 8400, while the sum is 28.

The square root of 20355742 is about 4511.7338130701. The cubic root of 20355742 is about 273.0416999905.

It can be divided in two parts, 2035 and 5742, that added together give a palindrome (7777).

The spelling of 20355742 in words is "twenty million, three hundred fifty-five thousand, seven hundred forty-two".