20898901 has 2 divisors, whose sum is σ = 20898902. Its totient is φ = 20898900.

The previous prime is 20898887. The next prime is 20898931. The reversal of 20898901 is 10989802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19140625 + 1758276 = 4375^2 + 1326^2 .

It is a cyclic number.

It is not a de Polignac number, because 20898901 - 2⁵ = 20898869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20898931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10449450 + 10449451.

It is an arithmetic number, because the mean of its divisors is an integer number (10449451).

Almost surely, 2^20898901 is an apocalyptic number.

It is an amenable number.

20898901 is a deficient number, since it is larger than the sum of its proper divisors (1).

20898901 is an equidigital number, since it uses as much as digits as its factorization.

20898901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 20898901 is about 4571.5315814287. The cubic root of 20898901 is about 275.4489679885.

Subtracting from 20898901 its reverse (10989802), we obtain a palindrome (9909099).

The spelling of 20898901 in words is "twenty million, eight hundred ninety-eight thousand, nine hundred one".