20646101 has 6 divisors (see below), whose sum is σ = 24016950. Its totient is φ = 17696616.

The previous prime is 20646091. The next prime is 20646107. The reversal of 20646101 is 10164602.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18054001 + 2592100 = 4249^2 + 1610^2 .

It is not a de Polignac number, because 20646101 - 2¹⁴ = 20629717 is a prime.

It is a super-2 number, since 2×20646101² = 852522973004402, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20646107) 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, 210626 + ... + 210723.

It is an arithmetic number, because the mean of its divisors is an integer number (4002825).

Almost surely, 2^20646101 is an apocalyptic number.

It is an amenable number.

20646101 is a deficient number, since it is larger than the sum of its proper divisors (3370849).

20646101 is an equidigital number, since it uses as much as digits as its factorization.

20646101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421363 (or 421356 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 20646101 is about 4543.7980809010. The cubic root of 20646101 is about 274.3338188999. Note that the first 3 decimals are identical.

The spelling of 20646101 in words is "twenty million, six hundred forty-six thousand, one hundred one".