20010405 has 16 divisors (see below), whose sum is σ = 32074560. Its totient is φ = 10652928.

The previous prime is 20010373. The next prime is 20010409. The reversal of 20010405 is 50401002.

It is not a de Polignac number, because 20010405 - 2⁵ = 20010373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12109 + ... + 13661.

It is an arithmetic number, because the mean of its divisors is an integer number (2004660).

Almost surely, 2^20010405 is an apocalyptic number.

It is an amenable number.

20010405 is a deficient number, since it is larger than the sum of its proper divisors (12064155).

20010405 is a wasteful number, since it uses less digits than its factorization.

20010405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2420.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 20010405 is about 4473.2991181006. The cubic root of 20010405 is about 271.4888260242.

Adding to 20010405 its reverse (50401002), we get a palindrome (70411407).

The spelling of 20010405 in words is "twenty million, ten thousand, four hundred five".