20447307 has 6 divisors (see below), whose sum is σ = 29535012. Its totient is φ = 13631532.

The previous prime is 20447293. The next prime is 20447341. The reversal of 20447307 is 70374402.

It is not a de Polignac number, because 20447307 - 2⁷ = 20447179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20497307) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1135953 + ... + 1135970.

It is an arithmetic number, because the mean of its divisors is an integer number (4922502).

Almost surely, 2^20447307 is an apocalyptic number.

20447307 is a deficient number, since it is larger than the sum of its proper divisors (9087705).

20447307 is a wasteful number, since it uses less digits than its factorization.

20447307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2271929 (or 2271926 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 27.

The square root of 20447307 is about 4521.8698565969. The cubic root of 20447307 is about 273.4504899647.

The spelling of 20447307 in words is "twenty million, four hundred forty-seven thousand, three hundred seven".