20920742 has 16 divisors (see below), whose sum is σ = 32471712. Its totient is φ = 10102080.

The previous prime is 20920741. The next prime is 20920763. The reversal of 20920742 is 24702902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20920741) 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, 7208 + ... + 9684.

It is an arithmetic number, because the mean of its divisors is an integer number (2029482).

Almost surely, 2^20920742 is an apocalyptic number.

20920742 is a deficient number, since it is larger than the sum of its proper divisors (11550970).

20920742 is a wasteful number, since it uses less digits than its factorization.

20920742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2623.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20920742 is about 4573.9197631791. The cubic root of 20920742 is about 275.5448898804.

The spelling of 20920742 in words is "twenty million, nine hundred twenty thousand, seven hundred forty-two".