20015401 has 4 divisors (see below), whose sum is σ = 22874752. Its totient is φ = 17156052.

The previous prime is 20015393. The next prime is 20015419. The reversal of 20015401 is 10451002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10451002 = 2 ⋅5225501.

It is a cyclic number.

It is not a de Polignac number, because 20015401 - 2³ = 20015393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20015431) 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 3 ways as a sum of consecutive naturals, for example, 1429665 + ... + 1429678.

It is an arithmetic number, because the mean of its divisors is an integer number (5718688).

Almost surely, 2^20015401 is an apocalyptic number.

It is an amenable number.

20015401 is a deficient number, since it is larger than the sum of its proper divisors (2859351).

20015401 is an equidigital number, since it uses as much as digits as its factorization.

20015401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2859350.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 20015401 is about 4473.8575077890. The cubic root of 20015401 is about 271.5114183590.

Adding to 20015401 its reverse (10451002), we get a palindrome (30466403).

The spelling of 20015401 in words is "twenty million, fifteen thousand, four hundred one".