20461545 has 64 divisors (see below), whose sum is σ = 39916800. Its totient is φ = 9884160.

The previous prime is 20461543. The next prime is 20461547. The reversal of 20461545 is 54516402.

20461545 is a `hidden beast` number, since 2 + 0 + 4 + 615 + 45 = 666.

It is an interprime number because it is at equal distance from previous prime (20461543) and next prime (20461547).

It is not a de Polignac number, because 20461545 - 2¹ = 20461543 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20461541) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 156130 + ... + 156260.

It is an arithmetic number, because the mean of its divisors is an integer number (623700).

Almost surely, 2^20461545 is an apocalyptic number.

It is an amenable number.

20461545 is a deficient number, since it is larger than the sum of its proper divisors (19455255).

20461545 is a wasteful number, since it uses less digits than its factorization.

20461545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247 (or 241 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 20461545 is about 4523.4439313426. The cubic root of 20461545 is about 273.5139455049.

Adding to 20461545 its reverse (54516402), we get a palindrome (74977947).

The spelling of 20461545 in words is "twenty million, four hundred sixty-one thousand, five hundred forty-five".