20265401 has 4 divisors (see below), whose sum is σ = 21824292. Its totient is φ = 18706512.

The previous prime is 20265391. The next prime is 20265407. The reversal of 20265401 is 10456202.

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: 10456202 = 2 ⋅5228101.

It can be written as a sum of positive squares in 2 ways, for example, as 3258025 + 17007376 = 1805^2 + 4124^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20265401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20265407) 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, 779426 + ... + 779451.

It is an arithmetic number, because the mean of its divisors is an integer number (5456073).

Almost surely, 2^20265401 is an apocalyptic number.

It is an amenable number.

20265401 is a deficient number, since it is larger than the sum of its proper divisors (1558891).

20265401 is a wasteful number, since it uses less digits than its factorization.

20265401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1558890.

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

The square root of 20265401 is about 4501.7108969813. The cubic root of 20265401 is about 272.6371713508.

The spelling of 20265401 in words is "twenty million, two hundred sixty-five thousand, four hundred one".