20717142 has 32 divisors (see below), whose sum is σ = 43148160. Its totient is φ = 6625920.

The previous prime is 20717141. The next prime is 20717143. The reversal of 20717142 is 24171702.

It is an interprime number because it is at equal distance from previous prime (20717141) and next prime (20717143).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20717141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14542 + ... + 15902.

It is an arithmetic number, because the mean of its divisors is an integer number (1348380).

Almost surely, 2^20717142 is an apocalyptic number.

20717142 is an abundant number, since it is smaller than the sum of its proper divisors (22431018).

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

20717142 is a wasteful number, since it uses less digits than its factorization.

20717142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1468.

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 20717142 is about 4551.6087265933. The cubic root of 20717142 is about 274.6481096924.

Adding to 20717142 its reverse (24171702), we get a palindrome (44888844).

The spelling of 20717142 in words is "twenty million, seven hundred seventeen thousand, one hundred forty-two".