20270405 has 8 divisors (see below), whose sum is σ = 24353784. Its totient is φ = 16196800.

The previous prime is 20270389. The next prime is 20270417. The reversal of 20270405 is 50407202.

It can be written as a sum of positive squares in 4 ways, for example, as 7086244 + 13184161 = 2662^2 + 3631^2 .

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

It is not a de Polignac number, because 20270405 - 2⁴ = 20270389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3395 + ... + 7215.

It is an arithmetic number, because the mean of its divisors is an integer number (3044223).

Almost surely, 2^20270405 is an apocalyptic number.

It is an amenable number.

20270405 is a deficient number, since it is larger than the sum of its proper divisors (4083379).

20270405 is a wasteful number, since it uses less digits than its factorization.

20270405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4887.

The product of its (nonzero) digits is 560, while the sum is 20.

The square root of 20270405 is about 4502.2666513657. The cubic root of 20270405 is about 272.6596096621.

Adding to 20270405 its reverse (50407202), we get a palindrome (70677607).

It can be divided in two parts, 202 and 70405, that added together give a palindrome (70607).

The spelling of 20270405 in words is "twenty million, two hundred seventy thousand, four hundred five".