20720107 has 2 divisors, whose sum is σ = 20720108. Its totient is φ = 20720106.

The previous prime is 20720087. The next prime is 20720113. The reversal of 20720107 is 70102702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20720107 - 2¹⁵ = 20687339 is a prime.

It is not a weakly prime, because it can be changed into another prime (20723107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10360053 + 10360054.

It is an arithmetic number, because the mean of its divisors is an integer number (10360054).

Almost surely, 2^20720107 is an apocalyptic number.

20720107 is a deficient number, since it is larger than the sum of its proper divisors (1).

20720107 is an equidigital number, since it uses as much as digits as its factorization.

20720107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 196, while the sum is 19.

The square root of 20720107 is about 4551.9344239565. The cubic root of 20720107 is about 274.6612114481.

Adding to 20720107 its reverse (70102702), we get a palindrome (90822809).

The spelling of 20720107 in words is "twenty million, seven hundred twenty thousand, one hundred seven".