20954261 has 4 divisors (see below), whose sum is σ = 20968332. Its totient is φ = 20940192.

The previous prime is 20954257. The next prime is 20954267. The reversal of 20954261 is 16245902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16245902 = 2 ⋅8122951.

It can be written as a sum of positive squares in 2 ways, for example, as 4906225 + 16048036 = 2215^2 + 4006^2 .

It is a cyclic number.

It is not a de Polignac number, because 20954261 - 2² = 20954257 is a prime.

It is a super-2 number, since 2×20954261² = 878162108112242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20954267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4496 + ... + 7881.

It is an arithmetic number, because the mean of its divisors is an integer number (5242083).

Almost surely, 2^20954261 is an apocalyptic number.

It is an amenable number.

20954261 is a deficient number, since it is larger than the sum of its proper divisors (14071).

20954261 is a wasteful number, since it uses less digits than its factorization.

20954261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14070.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 20954261 is about 4577.5824405465. The cubic root of 20954261 is about 275.6919697648.

The spelling of 20954261 in words is "twenty million, nine hundred fifty-four thousand, two hundred sixty-one".