20153145 has 16 divisors (see below), whose sum is σ = 32391360. Its totient is φ = 10699584.

The previous prime is 20153141. The next prime is 20153153. The reversal of 20153145 is 54135102.

It is not a de Polignac number, because 20153145 - 2² = 20153141 is a prime.

It is a super-2 number, since 2×20153145² = 812298506782050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20153141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 502 + ... + 6368.

It is an arithmetic number, because the mean of its divisors is an integer number (2024460).

Almost surely, 2^20153145 is an apocalyptic number.

It is an amenable number.

20153145 is a deficient number, since it is larger than the sum of its proper divisors (12238215).

20153145 is a wasteful number, since it uses less digits than its factorization.

20153145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6104.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 20153145 is about 4489.2254343038. The cubic root of 20153145 is about 272.1328332234.

Adding to 20153145 its reverse (54135102), we get a palindrome (74288247).

The spelling of 20153145 in words is "twenty million, one hundred fifty-three thousand, one hundred forty-five".