20019261 has 8 divisors (see below), whose sum is σ = 26713024. Its totient is φ = 13335840.

The previous prime is 20019247. The next prime is 20019271. The reversal of 20019261 is 16291002.

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

It is not a de Polignac number, because 20019261 - 2⁵ = 20019229 is a prime.

It is a super-2 number, since 2×20019261² = 801541621972242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20019221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6240 + ... + 8886.

It is an arithmetic number, because the mean of its divisors is an integer number (3339128).

Almost surely, 2^20019261 is an apocalyptic number.

It is an amenable number.

20019261 is a deficient number, since it is larger than the sum of its proper divisors (6693763).

20019261 is a wasteful number, since it uses less digits than its factorization.

20019261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5171.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 20019261 is about 4474.2888820460. The cubic root of 20019261 is about 271.5288710314.

The spelling of 20019261 in words is "twenty million, nineteen thousand, two hundred sixty-one".