20252506 has 8 divisors (see below), whose sum is σ = 30418740. Its totient is φ = 10112928.

The previous prime is 20252503. The next prime is 20252509. The reversal of 20252506 is 60525202.

It is an interprime number because it is at equal distance from previous prime (20252503) and next prime (20252509).

It can be written as a sum of positive squares in 2 ways, for example, as 15880225 + 4372281 = 3985^2 + 2091^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20252501) 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, 4641 + ... + 7876.

Almost surely, 2^20252506 is an apocalyptic number.

20252506 is the 2406-th centered heptagonal number.

20252506 is a deficient number, since it is larger than the sum of its proper divisors (10166234).

20252506 is a wasteful number, since it uses less digits than its factorization.

20252506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13328.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 20252506 is about 4500.2784358304. The cubic root of 20252506 is about 272.5793321751.

Adding to 20252506 its reverse (60525202), we get a palindrome (80777708).

The spelling of 20252506 in words is "twenty million, two hundred fifty-two thousand, five hundred six".