20614621 has 4 divisors (see below), whose sum is σ = 21325500. Its totient is φ = 19903744.

The previous prime is 20614619. The next prime is 20614667. The reversal of 20614621 is 12641602.

20614621 = 3210² + 3211².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10310521 + 10304100 = 3211^2 + 3210^2 .

It is not a de Polignac number, because 20614621 - 2¹ = 20614619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20614592 and 20614601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20614691) 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, 355396 + ... + 355453.

It is an arithmetic number, because the mean of its divisors is an integer number (5331375).

Almost surely, 2^20614621 is an apocalyptic number.

20614621 is the 3211-st centered square number.

It is an amenable number.

20614621 is a deficient number, since it is larger than the sum of its proper divisors (710879).

20614621 is an equidigital number, since it uses as much as digits as its factorization.

20614621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710878.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 20614621 is about 4540.3326970609. The cubic root of 20614621 is about 274.1943184428.

The spelling of 20614621 in words is "twenty million, six hundred fourteen thousand, six hundred twenty-one".