20100545 has 8 divisors (see below), whose sum is σ = 25539624. Its totient is φ = 15134464.

The previous prime is 20100541. The next prime is 20100557. The reversal of 20100545 is 54500102.

It can be written as a sum of positive squares in 4 ways, for example, as 5895184 + 14205361 = 2428^2 + 3769^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20100545 - 2² = 20100541 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20100541) 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, 118154 + ... + 118323.

It is an arithmetic number, because the mean of its divisors is an integer number (3192453).

Almost surely, 2^20100545 is an apocalyptic number.

It is an amenable number.

20100545 is a deficient number, since it is larger than the sum of its proper divisors (5439079).

20100545 is a wasteful number, since it uses less digits than its factorization.

20100545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236499.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 20100545 is about 4483.3631349691. The cubic root of 20100545 is about 271.8958700674.

Adding to 20100545 its reverse (54500102), we get a palindrome (74600647).

The spelling of 20100545 in words is "twenty million, one hundred thousand, five hundred forty-five".