20906801 has 2 divisors, whose sum is σ = 20906802. Its totient is φ = 20906800.

The previous prime is 20906789. The next prime is 20906807. The reversal of 20906801 is 10860902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18879025 + 2027776 = 4345^2 + 1424^2 .

It is a cyclic number.

It is not a de Polignac number, because 20906801 - 2⁶ = 20906737 is a prime.

It is not a weakly prime, because it can be changed into another prime (20906807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10453400 + 10453401.

It is an arithmetic number, because the mean of its divisors is an integer number (10453401).

Almost surely, 2^20906801 is an apocalyptic number.

It is an amenable number.

20906801 is a deficient number, since it is larger than the sum of its proper divisors (1).

20906801 is an equidigital number, since it uses as much as digits as its factorization.

20906801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 20906801 is about 4572.3955428200. The cubic root of 20906801 is about 275.4836711325.

The spelling of 20906801 in words is "twenty million, nine hundred six thousand, eight hundred one".