201020004 has 18 divisors (see below), whose sum is σ = 508133990. Its totient is φ = 67006656.

The previous prime is 201019999. The next prime is 201020009. The reversal of 201020004 is 400020102.

It is an interprime number because it is at equal distance from previous prime (201019999) and next prime (201020009).

It can be written as a sum of positive squares in only one way, i.e., 189117504 + 11902500 = 13752^2 + 3450^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-4 number, since 4×201020004⁴ (a number of 34 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (201020009) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2791909 + ... + 2791980.

Almost surely, 2^201020004 is an apocalyptic number.

It is an amenable number.

201020004 is an abundant number, since it is smaller than the sum of its proper divisors (307113986).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201020004 is a wasteful number, since it uses less digits than its factorization.

201020004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5583899 (or 5583894 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 201020004 is about 14178.1523478908. The cubic root of 201020004 is about 585.7960322491.

Adding to 201020004 its reverse (400020102), we get a palindrome (601040106).

The spelling of 201020004 in words is "two hundred one million, twenty thousand, four".