20725202 has 4 divisors (see below), whose sum is σ = 31087806. Its totient is φ = 10362600.

The previous prime is 20725171. The next prime is 20725241. The reversal of 20725202 is 20252702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20252702 = 2 ⋅10126351.

It can be written as a sum of positive squares in only one way, i.e., 13697401 + 7027801 = 3701^2 + 2651^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5181299 + ... + 5181302.

Almost surely, 2^20725202 is an apocalyptic number.

20725202 is a deficient number, since it is larger than the sum of its proper divisors (10362604).

20725202 is a wasteful number, since it uses less digits than its factorization.

20725202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10362603.

The product of its (nonzero) digits is 560, while the sum is 20.

The square root of 20725202 is about 4552.4940417314. The cubic root of 20725202 is about 274.6837223387.

Adding to 20725202 its reverse (20252702), we get a palindrome (40977904).

The spelling of 20725202 in words is "twenty million, seven hundred twenty-five thousand, two hundred two".