20713242 has 32 divisors (see below), whose sum is σ = 47853504. Its totient is φ = 5907200.

The previous prime is 20713219. The next prime is 20713243. The reversal of 20713242 is 24231702.

It is not an unprimeable number, because it can be changed into a prime (20713243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8109 + ... + 10352.

It is an arithmetic number, because the mean of its divisors is an integer number (1495422).

Almost surely, 2^20713242 is an apocalyptic number.

20713242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20713242 is an abundant number, since it is smaller than the sum of its proper divisors (27140262).

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

20713242 is a wasteful number, since it uses less digits than its factorization.

20713242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18494.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 20713242 is about 4551.1802864751. The cubic root of 20713242 is about 274.6308744508.

Adding to 20713242 its reverse (24231702), we get a palindrome (44944944).

The spelling of 20713242 in words is "twenty million, seven hundred thirteen thousand, two hundred forty-two".