20642601 has 8 divisors (see below), whose sum is σ = 31455424. Its totient is φ = 11795760.

The previous prime is 20642597. The next prime is 20642603. The reversal of 20642601 is 10624602.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20642601 - 2² = 20642597 is a prime.

It is a super-2 number, since 2×20642601² = 852233952090402, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 982981 = 20642601 / (2 + 0 + 6 + 4 + 2 + 6 + 0 + 1).

It is not an unprimeable number, because it can be changed into a prime (20642603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 491470 + ... + 491511.

It is an arithmetic number, because the mean of its divisors is an integer number (3931928).

Almost surely, 2^20642601 is an apocalyptic number.

20642601 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20642601 is a deficient number, since it is larger than the sum of its proper divisors (10812823).

20642601 is an equidigital number, since it uses as much as digits as its factorization.

20642601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982991.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 20642601 is about 4543.4129242234. The cubic root of 20642601 is about 274.3183160110.

The spelling of 20642601 in words is "twenty million, six hundred forty-two thousand, six hundred one".