20426737 has 8 divisors (see below), whose sum is σ = 22003200. Its totient is φ = 18907680.

The previous prime is 20426719. The next prime is 20426743. The reversal of 20426737 is 73762402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20426737 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20426699 and 20426708.

It is not an unprimeable number, because it can be changed into a prime (20426137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13612 + ... + 15037.

It is an arithmetic number, because the mean of its divisors is an integer number (2750400).

Almost surely, 2^20426737 is an apocalyptic number.

It is an amenable number.

20426737 is a deficient number, since it is larger than the sum of its proper divisors (1576463).

20426737 is a wasteful number, since it uses less digits than its factorization.

20426737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28703.

The product of its (nonzero) digits is 14112, while the sum is 31.

The square root of 20426737 is about 4519.5947827211. The cubic root of 20426737 is about 273.3587620932.

It can be divided in two parts, 204267 and 37, that added together give a square (204304 = 452²).

The spelling of 20426737 in words is "twenty million, four hundred twenty-six thousand, seven hundred thirty-seven".