20870742 has 16 divisors (see below), whose sum is σ = 41923440. Its totient is φ = 6926592.

The previous prime is 20870693. The next prime is 20870743. The reversal of 20870742 is 24707802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20870743) 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, 6067 + ... + 8862.

It is an arithmetic number, because the mean of its divisors is an integer number (2620215).

Almost surely, 2^20870742 is an apocalyptic number.

20870742 is an abundant number, since it is smaller than the sum of its proper divisors (21052698).

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

20870742 is a wasteful number, since it uses less digits than its factorization.

20870742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15167.

The product of its (nonzero) digits is 6272, while the sum is 30.

The square root of 20870742 is about 4568.4507220720. The cubic root of 20870742 is about 275.3251998580.

It can be divided in two parts, 20870 and 742, that added together give a palindrome (21612).

The spelling of 20870742 in words is "twenty million, eight hundred seventy thousand, seven hundred forty-two".