20206961 has 2 divisors, whose sum is σ = 20206962. Its totient is φ = 20206960.

The previous prime is 20206951. The next prime is 20206981. The reversal of 20206961 is 16960202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20205025 + 1936 = 4495^2 + 44^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20206961 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20206961.

It is not a weakly prime, because it can be changed into another prime (20206951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10103480 + 10103481.

It is an arithmetic number, because the mean of its divisors is an integer number (10103481).

Almost surely, 2^20206961 is an apocalyptic number.

It is an amenable number.

20206961 is a deficient number, since it is larger than the sum of its proper divisors (1).

20206961 is an equidigital number, since it uses as much as digits as its factorization.

20206961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 20206961 is about 4495.2153452310. The cubic root of 20206961 is about 272.3748481215.

The spelling of 20206961 in words is "twenty million, two hundred six thousand, nine hundred sixty-one".