20945501 has 8 divisors (see below), whose sum is σ = 21296184. Its totient is φ = 20597760.

The previous prime is 20945489. The next prime is 20945521. The reversal of 20945501 is 10554902.

It can be written as a sum of positive squares in 4 ways, for example, as 24025 + 20921476 = 155^2 + 4574^2 .

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 20945501 - 2¹⁰ = 20944477 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 (20945521) 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, 16961 + ... + 18153.

It is an arithmetic number, because the mean of its divisors is an integer number (2662023).

Almost surely, 2^20945501 is an apocalyptic number.

It is an amenable number.

20945501 is a deficient number, since it is larger than the sum of its proper divisors (350683).

20945501 is a wasteful number, since it uses less digits than its factorization.

20945501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 20945501 is about 4576.6255035779. The cubic root of 20945501 is about 275.6535464218.

The spelling of 20945501 in words is "twenty million, nine hundred forty-five thousand, five hundred one".