20025961 has 4 divisors (see below), whose sum is σ = 20141892. Its totient is φ = 19910032.

The previous prime is 20025959. The next prime is 20025989. The reversal of 20025961 is 16952002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16952002 = 2 ⋅8476001.

It can be written as a sum of positive squares in 2 ways, for example, as 14592400 + 5433561 = 3820^2 + 2331^2 .

It is a cyclic number.

It is not a de Polignac number, because 20025961 - 2¹ = 20025959 is a prime.

It is a super-2 number, since 2×20025961² = 802078227947042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20025911) 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 3 ways as a sum of consecutive naturals, for example, 57706 + ... + 58051.

It is an arithmetic number, because the mean of its divisors is an integer number (5035473).

Almost surely, 2^20025961 is an apocalyptic number.

It is an amenable number.

20025961 is a deficient number, since it is larger than the sum of its proper divisors (115931).

20025961 is a wasteful number, since it uses less digits than its factorization.

20025961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115930.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 20025961 is about 4475.0375417420. The cubic root of 20025961 is about 271.5591592044.

Adding to 20025961 its reverse (16952002), we get a palindrome (36977963).

The spelling of 20025961 in words is "twenty million, twenty-five thousand, nine hundred sixty-one".