20042320 has 40 divisors (see below), whose sum is σ = 49342824. Its totient is φ = 7544832.

The previous prime is 20042299. The next prime is 20042327. The reversal of 20042320 is 2324002.

It can be written as a sum of positive squares in 4 ways, for example, as 7595536 + 12446784 = 2756^2 + 3528^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 20042320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20042327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6009 + ... + 8728.

Almost surely, 2^20042320 is an apocalyptic number.

20042320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20042320 is an abundant number, since it is smaller than the sum of its proper divisors (29300504).

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

20042320 is a wasteful number, since it uses less digits than its factorization.

20042320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14767 (or 14761 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 13.

The square root of 20042320 is about 4476.8649745106. The cubic root of 20042320 is about 271.6330836996.

Adding to 20042320 its reverse (2324002), we get a palindrome (22366322).

The spelling of 20042320 in words is "twenty million, forty-two thousand, three hundred twenty".