20153745 has 16 divisors (see below), whose sum is σ = 35829120. Its totient is φ = 10748592.

The previous prime is 20153743. The next prime is 20153759. The reversal of 20153745 is 54735102.

It is a happy number.

It is not a de Polignac number, because 20153745 - 2¹ = 20153743 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 (20153743) 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 15 ways as a sum of consecutive naturals, for example, 74509 + ... + 74778.

It is an arithmetic number, because the mean of its divisors is an integer number (2239320).

Almost surely, 2^20153745 is an apocalyptic number.

It is an amenable number.

20153745 is a deficient number, since it is larger than the sum of its proper divisors (15675375).

20153745 is a wasteful number, since it uses less digits than its factorization.

20153745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149301 (or 149295 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 20153745 is about 4489.2922604794. The cubic root of 20153745 is about 272.1355338454.

Adding to 20153745 its reverse (54735102), we get a palindrome (74888847).

The spelling of 20153745 in words is "twenty million, one hundred fifty-three thousand, seven hundred forty-five".