20742906 has 16 divisors (see below), whose sum is σ = 42824448. Its totient is φ = 6691200.

The previous prime is 20742901. The next prime is 20742919. The reversal of 20742906 is 60924702.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20742901) 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 7 ways as a sum of consecutive naturals, for example, 55575 + ... + 55946.

It is an arithmetic number, because the mean of its divisors is an integer number (2676528).

Almost surely, 2^20742906 is an apocalyptic number.

20742906 is an abundant number, since it is smaller than the sum of its proper divisors (22081542).

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

20742906 is a wasteful number, since it uses less digits than its factorization.

20742906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111557.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 20742906 is about 4554.4380553478. The cubic root of 20742906 is about 274.7619140427.

The spelling of 20742906 in words is "twenty million, seven hundred forty-two thousand, nine hundred six".