20210001 has 12 divisors (see below), whose sum is σ = 31346352. Its totient is φ = 11548488.

The previous prime is 20209993. The next prime is 20210023. The reversal of 20210001 is 10001202.

It is a happy number.

It is not a de Polignac number, because 20210001 - 2³ = 20209993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20210101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68595 + ... + 68888.

It is an arithmetic number, because the mean of its divisors is an integer number (2612196).

Almost surely, 2^20210001 is an apocalyptic number.

20210001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20210001 is a deficient number, since it is larger than the sum of its proper divisors (11136351).

20210001 is a wasteful number, since it uses less digits than its factorization.

20210001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137500 (or 137493 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 20210001 is about 4495.5534698188. The cubic root of 20210001 is about 272.3885064184.

Adding to 20210001 its reverse (10001202), we get a palindrome (30211203).

It can be divided in two parts, 202 and 10001, that multiplied together give a palindrome (2020202).

The spelling of 20210001 in words is "twenty million, two hundred ten thousand, one".