20890641 has 8 divisors (see below), whose sum is σ = 27889920. Its totient is φ = 13909232.

The previous prime is 20890619. The next prime is 20890663. The reversal of 20890641 is 14609802.

It is an interprime number because it is at equal distance from previous prime (20890619) and next prime (20890663).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20890641 - 2¹⁴ = 20874257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20890599 and 20890608.

It is not an unprimeable number, because it can be changed into a prime (20890691) 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 7 ways as a sum of consecutive naturals, for example, 1446 + ... + 6623.

It is an arithmetic number, because the mean of its divisors is an integer number (3486240).

Almost surely, 2^20890641 is an apocalyptic number.

It is an amenable number.

20890641 is a deficient number, since it is larger than the sum of its proper divisors (6999279).

20890641 is an equidigital number, since it uses as much as digits as its factorization.

20890641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8935.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 20890641 is about 4570.6280750024. The cubic root of 20890641 is about 275.4126740818.

The spelling of 20890641 in words is "twenty million, eight hundred ninety thousand, six hundred forty-one".