20654101 has 4 divisors (see below), whose sum is σ = 22242892. Its totient is φ = 19065312.

The previous prime is 20654077. The next prime is 20654107. The reversal of 20654101 is 10145602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10145602 = 2 ⋅5072801.

It can be written as a sum of positive squares in 2 ways, for example, as 9424900 + 11229201 = 3070^2 + 3351^2 .

It is a cyclic number.

It is not a de Polignac number, because 20654101 - 2⁷ = 20653973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20654107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 794376 + ... + 794401.

It is an arithmetic number, because the mean of its divisors is an integer number (5560723).

Almost surely, 2^20654101 is an apocalyptic number.

It is an amenable number.

20654101 is a deficient number, since it is larger than the sum of its proper divisors (1588791).

20654101 is a wasteful number, since it uses less digits than its factorization.

20654101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1588790.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 20654101 is about 4544.6783164488. The cubic root of 20654101 is about 274.3692474964.

Adding to 20654101 its reverse (10145602), we get a palindrome (30799703).

The spelling of 20654101 in words is "twenty million, six hundred fifty-four thousand, one hundred one".