20746973 has 8 divisors (see below), whose sum is σ = 22947288. Its totient is φ = 18633024.

The previous prime is 20746963. The next prime is 20747011. The reversal of 20746973 is 37964702.

It can be written as a sum of positive squares in 4 ways, for example, as 1545049 + 19201924 = 1243^2 + 4382^2 .

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 20746973 - 2⁸ = 20746717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20746933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21086 + ... + 22047.

It is an arithmetic number, because the mean of its divisors is an integer number (2868411).

Almost surely, 2^20746973 is an apocalyptic number.

It is an amenable number.

20746973 is a deficient number, since it is larger than the sum of its proper divisors (2200315).

20746973 is a wasteful number, since it uses less digits than its factorization.

20746973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43183.

The product of its (nonzero) digits is 63504, while the sum is 38.

The square root of 20746973 is about 4554.8845210389. The cubic root of 20746973 is about 274.7798701201.

The spelling of 20746973 in words is "twenty million, seven hundred forty-six thousand, nine hundred seventy-three".