20100401 has 2 divisors, whose sum is σ = 20100402. Its totient is φ = 20100400.

The previous prime is 20100397. The next prime is 20100403. The reversal of 20100401 is 10400102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19536400 + 564001 = 4420^2 + 751^2 .

It is a cyclic number.

It is not a de Polignac number, because 20100401 - 2² = 20100397 is a prime.

It is a super-2 number, since 2×20100401² = 808052240721602, which contains 22 as substring.

Together with 20100403, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20100403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050200 + 10050201.

It is an arithmetic number, because the mean of its divisors is an integer number (10050201).

Almost surely, 2^20100401 is an apocalyptic number.

It is an amenable number.

20100401 is a deficient number, since it is larger than the sum of its proper divisors (1).

20100401 is an equidigital number, since it uses as much as digits as its factorization.

20100401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 20100401 is about 4483.3470755675. The cubic root of 20100401 is about 271.8952207799.

Adding to 20100401 its reverse (10400102), we get a palindrome (30500503).

The spelling of 20100401 in words is "twenty million, one hundred thousand, four hundred one".