20957742 has 24 divisors (see below), whose sum is σ = 48901944. Its totient is φ = 6448464.

The previous prime is 20957731. The next prime is 20957777. The reversal of 20957742 is 24775902.

It is a junction number, because it is equal to n+sod(n) for n = 20957697 and 20957706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44548 + ... + 45015.

It is an arithmetic number, because the mean of its divisors is an integer number (2037581).

Almost surely, 2^20957742 is an apocalyptic number.

20957742 is an abundant number, since it is smaller than the sum of its proper divisors (27944202).

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

20957742 is a wasteful number, since it uses less digits than its factorization.

20957742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89584 (or 89581 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 20957742 is about 4577.9626472919. The cubic root of 20957742 is about 275.7072352457.

The spelling of 20957742 in words is "twenty million, nine hundred fifty-seven thousand, seven hundred forty-two".