20523153 has 16 divisors (see below), whose sum is σ = 32633856. Its totient is φ = 11217360.

The previous prime is 20523149. The next prime is 20523157. The reversal of 20523153 is 35132502.

It is an interprime number because it is at equal distance from previous prime (20523149) and next prime (20523157).

It is not a de Polignac number, because 20523153 - 2² = 20523149 is a prime.

It is a super-2 number, since 2×20523153² = 842399618122818, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (20523157) 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, 20763 + ... + 21728.

It is an arithmetic number, because the mean of its divisors is an integer number (2039616).

Almost surely, 2^20523153 is an apocalyptic number.

20523153 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20523153 is a deficient number, since it is larger than the sum of its proper divisors (12110703).

20523153 is a wasteful number, since it uses less digits than its factorization.

20523153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42524.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 20523153 is about 4530.2486686715. The cubic root of 20523153 is about 273.7881796585.

Adding to 20523153 its reverse (35132502), we get a palindrome (55655655).

The spelling of 20523153 in words is "twenty million, five hundred twenty-three thousand, one hundred fifty-three".