20742860 has 12 divisors (see below), whose sum is σ = 43560048. Its totient is φ = 8297136.

The previous prime is 20742857. The next prime is 20742881. The reversal of 20742860 is 6824702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 518552 + ... + 518591.

It is an arithmetic number, because the mean of its divisors is an integer number (3630004).

Almost surely, 2^20742860 is an apocalyptic number.

20742860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20742860 is an abundant number, since it is smaller than the sum of its proper divisors (22817188).

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

20742860 is a wasteful number, since it uses less digits than its factorization.

20742860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037152 (or 1037150 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 20742860 is about 4554.4330053257. The cubic root of 20742860 is about 274.7617109362.

The spelling of 20742860 in words is "twenty million, seven hundred forty-two thousand, eight hundred sixty".