20261530 has 8 divisors (see below), whose sum is σ = 36470772. Its totient is φ = 8104608.

The previous prime is 20261519. The next prime is 20261567. The reversal of 20261530 is 3516202.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19456921 + 804609 = 4411^2 + 897^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 20261498 and 20261507.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1013067 + ... + 1013086.

Almost surely, 2^20261530 is an apocalyptic number.

20261530 is a deficient number, since it is larger than the sum of its proper divisors (16209242).

20261530 is a wasteful number, since it uses less digits than its factorization.

20261530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2026160.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 20261530 is about 4501.2809288024. The cubic root of 20261530 is about 272.6198109624.

Adding to 20261530 its reverse (3516202), we get a palindrome (23777732).

The spelling of 20261530 in words is "twenty million, two hundred sixty-one thousand, five hundred thirty".