20333961 has 6 divisors (see below), whose sum is σ = 29371290. Its totient is φ = 13555968.

The previous prime is 20333953. The next prime is 20333977. The reversal of 20333961 is 16933302.

It can be written as a sum of positive squares in only one way, i.e., 16353936 + 3980025 = 4044^2 + 1995^2 .

It is not a de Polignac number, because 20333961 - 2³ = 20333953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20333941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1129656 + ... + 1129673.

It is an arithmetic number, because the mean of its divisors is an integer number (4895215).

Almost surely, 2^20333961 is an apocalyptic number.

It is an amenable number.

20333961 is a deficient number, since it is larger than the sum of its proper divisors (9037329).

20333961 is a wasteful number, since it uses less digits than its factorization.

20333961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2259335 (or 2259332 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 27.

The square root of 20333961 is about 4509.3193499685. The cubic root of 20333961 is about 272.9442787698.

The spelling of 20333961 in words is "twenty million, three hundred thirty-three thousand, nine hundred sixty-one".