20210004 has 18 divisors (see below), whose sum is σ = 51086490. Its totient is φ = 6736656.

The previous prime is 20209993. The next prime is 20210023. The reversal of 20210004 is 40001202.

It can be written as a sum of positive squares in only one way, i.e., 13176900 + 7033104 = 3630^2 + 2652^2 .

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

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 280659 + ... + 280730.

Almost surely, 2^20210004 is an apocalyptic number.

It is an amenable number.

20210004 is an abundant number, since it is smaller than the sum of its proper divisors (30876486).

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

20210004 is a wasteful number, since it uses less digits than its factorization.

20210004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561399 (or 561394 counting only the distinct ones).

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

The square root of 20210004 is about 4495.5538034818. The cubic root of 20210004 is about 272.3885198963.

Adding to 20210004 its reverse (40001202), we get a palindrome (60211206).

The spelling of 20210004 in words is "twenty million, two hundred ten thousand, four".