20940147 has 16 divisors (see below), whose sum is σ = 32656000. Its totient is φ = 13225032.

The previous prime is 20940137. The next prime is 20940149. The reversal of 20940147 is 74104902.

It is a happy number.

It is not a de Polignac number, because 20940147 - 2⁴ = 20940131 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20940147.

It is not an unprimeable number, because it can be changed into a prime (20940149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19897 + ... + 20922.

It is an arithmetic number, because the mean of its divisors is an integer number (2041000).

Almost surely, 2^20940147 is an apocalyptic number.

20940147 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20940147 is a deficient number, since it is larger than the sum of its proper divisors (11715853).

20940147 is a wasteful number, since it uses less digits than its factorization.

20940147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40847 (or 40841 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20940147 is about 4576.0405374079. The cubic root of 20940147 is about 275.6300572907.

The spelling of 20940147 in words is "twenty million, nine hundred forty thousand, one hundred forty-seven".