4020531405 has 32 divisors (see below), whose sum is σ = 7032089088. Its totient is φ = 1945339200.

The previous prime is 4020531401. The next prime is 4020531409. The reversal of 4020531405 is 5041350204.

It is an interprime number because it is at equal distance from previous prime (4020531401) and next prime (4020531409).

It is not a de Polignac number, because 4020531405 - 2² = 4020531401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4020531401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56202 + ... + 105828.

It is an arithmetic number, because the mean of its divisors is an integer number (219752784).

Almost surely, 2^4020531405 is an apocalyptic number.

It is an amenable number.

4020531405 is a deficient number, since it is larger than the sum of its proper divisors (3011557683).

4020531405 is a wasteful number, since it uses less digits than its factorization.

4020531405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50137.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 4020531405 is about 63407.6604599160. The cubic root of 4020531405 is about 1590.1123827847.

Adding to 4020531405 its reverse (5041350204), we get a palindrome (9061881609).

The spelling of 4020531405 in words is "four billion, twenty million, five hundred thirty-one thousand, four hundred five".