20672737 has 8 divisors (see below), whose sum is σ = 21609000. Its totient is φ = 19751424.

The previous prime is 20672683. The next prime is 20672747. The reversal of 20672737 is 73727602.

It can be written as a sum of positive squares in 4 ways, for example, as 4343056 + 16329681 = 2084^2 + 4041^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20672737 - 2⁷ = 20672609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20672747) 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, 862 + ... + 6487.

It is an arithmetic number, because the mean of its divisors is an integer number (2701125).

Almost surely, 2^20672737 is an apocalyptic number.

It is an amenable number.

20672737 is a deficient number, since it is larger than the sum of its proper divisors (936263).

20672737 is an equidigital number, since it uses as much as digits as its factorization.

20672737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7475.

The product of its (nonzero) digits is 24696, while the sum is 34.

The square root of 20672737 is about 4546.7281642957. The cubic root of 20672737 is about 274.4517429488.

The spelling of 20672737 in words is "twenty million, six hundred seventy-two thousand, seven hundred thirty-seven".