20625401 has 4 divisors (see below), whose sum is σ = 20838132. Its totient is φ = 20412672.

The previous prime is 20625379. The next prime is 20625413. The reversal of 20625401 is 10452602.

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: 10452602 = 2 ⋅5226301.

It can be written as a sum of positive squares in 2 ways, for example, as 12075625 + 8549776 = 3475^2 + 2924^2 .

It is a cyclic number.

It is not a de Polignac number, because 20625401 - 2¹⁰ = 20624377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20625421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106220 + ... + 106413.

It is an arithmetic number, because the mean of its divisors is an integer number (5209533).

Almost surely, 2^20625401 is an apocalyptic number.

It is an amenable number.

20625401 is a deficient number, since it is larger than the sum of its proper divisors (212731).

20625401 is an equidigital number, since it uses as much as digits as its factorization.

20625401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212730.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 20625401 is about 4541.5196795786. The cubic root of 20625401 is about 274.2421049090.

The spelling of 20625401 in words is "twenty million, six hundred twenty-five thousand, four hundred one".