20720241 has 12 divisors (see below), whose sum is σ = 31504720. Its totient is φ = 13086360.

The previous prime is 20720237. The next prime is 20720261. The reversal of 20720241 is 14202702.

It is not a de Polignac number, because 20720241 - 2² = 20720237 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20720221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60415 + ... + 60756.

Almost surely, 2^20720241 is an apocalyptic number.

It is an amenable number.

20720241 is a deficient number, since it is larger than the sum of its proper divisors (10784479).

20720241 is a wasteful number, since it uses less digits than its factorization.

20720241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121196 (or 121193 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 20720241 is about 4551.9491429496. The cubic root of 20720241 is about 274.6618035384.

Adding to 20720241 its reverse (14202702), we get a palindrome (34922943).

The spelling of 20720241 in words is "twenty million, seven hundred twenty thousand, two hundred forty-one".