20125247 has 4 divisors (see below), whose sum is σ = 20593320. Its totient is φ = 19657176.

The previous prime is 20125243. The next prime is 20125249. The reversal of 20125247 is 74252102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74252102 = 2 ⋅37126051.

It is a cyclic number.

It is not a de Polignac number, because 20125247 - 2² = 20125243 is a prime.

It is a super-2 number, since 2×20125247² = 810051133622018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20125241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233972 + ... + 234057.

It is an arithmetic number, because the mean of its divisors is an integer number (5148330).

Almost surely, 2^20125247 is an apocalyptic number.

20125247 is a deficient number, since it is larger than the sum of its proper divisors (468073).

20125247 is an equidigital number, since it uses as much as digits as its factorization.

20125247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468072.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 20125247 is about 4486.1171406908. The cubic root of 20125247 is about 272.0072040696.

Adding to 20125247 its reverse (74252102), we get a palindrome (94377349).

The spelling of 20125247 in words is "twenty million, one hundred twenty-five thousand, two hundred forty-seven".