20210742 has 32 divisors (see below), whose sum is σ = 45128160. Its totient is φ = 6704640.

The previous prime is 20210717. The next prime is 20210747. The reversal of 20210742 is 24701202.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20210747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12238 + ... + 13790.

It is an arithmetic number, because the mean of its divisors is an integer number (1410255).

Almost surely, 2^20210742 is an apocalyptic number.

20210742 is an abundant number, since it is smaller than the sum of its proper divisors (24917418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20210742 is a wasteful number, since it uses less digits than its factorization.

20210742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1805 (or 1799 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 20210742 is about 4495.6358838322. The cubic root of 20210742 is about 272.3918354206.

Adding to 20210742 its reverse (24701202), we get a palindrome (44911944).

The spelling of 20210742 in words is "twenty million, two hundred ten thousand, seven hundred forty-two".