20260521 has 6 divisors (see below), whose sum is σ = 29265210. Its totient is φ = 13507008.

The previous prime is 20260511. The next prime is 20260523. The reversal of 20260521 is 12506202.

It can be written as a sum of positive squares in only one way, i.e., 19900521 + 360000 = 4461^2 + 600^2 .

It is not a de Polignac number, because 20260521 - 2¹⁰ = 20259497 is a prime.

It is a super-2 number, since 2×20260521² = 820977422382882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20260494 and 20260503.

It is not an unprimeable number, because it can be changed into a prime (20260523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1125576 + ... + 1125593.

It is an arithmetic number, because the mean of its divisors is an integer number (4877535).

Almost surely, 2^20260521 is an apocalyptic number.

It is an amenable number.

20260521 is a deficient number, since it is larger than the sum of its proper divisors (9004689).

20260521 is a wasteful number, since it uses less digits than its factorization.

20260521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2251175 (or 2251172 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20260521 is about 4501.1688481993. The cubic root of 20260521 is about 272.6152855070.

Adding to 20260521 its reverse (12506202), we get a palindrome (32766723).

The spelling of 20260521 in words is "twenty million, two hundred sixty thousand, five hundred twenty-one".