20261613 has 8 divisors (see below), whose sum is σ = 27210400. Its totient is φ = 13410288.

The previous prime is 20261599. The next prime is 20261617. The reversal of 20261613 is 31616202.

It is a happy number.

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

It is not a de Polignac number, because 20261613 - 2¹⁷ = 20130541 is a prime.

It is a super-2 number, since 2×20261613² = 821065922723538, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20261613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20261617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23878 + ... + 24711.

It is an arithmetic number, because the mean of its divisors is an integer number (3401300).

Almost surely, 2^20261613 is an apocalyptic number.

It is an amenable number.

20261613 is a deficient number, since it is larger than the sum of its proper divisors (6948787).

20261613 is a wasteful number, since it uses less digits than its factorization.

20261613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48731.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 20261613 is about 4501.2901483908. The cubic root of 20261613 is about 272.6201832182.

Adding to 20261613 its reverse (31616202), we get a palindrome (51877815).

The spelling of 20261613 in words is "twenty million, two hundred sixty-one thousand, six hundred thirteen".