20147261 has 16 divisors (see below), whose sum is σ = 22161600. Its totient is φ = 18240768.

The previous prime is 20147251. The next prime is 20147273. The reversal of 20147261 is 16274102.

It is a cyclic number.

It is not a de Polignac number, because 20147261 - 2¹⁰ = 20146237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20147221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52970 + ... + 53348.

It is an arithmetic number, because the mean of its divisors is an integer number (1385100).

Almost surely, 2^20147261 is an apocalyptic number.

It is an amenable number.

20147261 is a deficient number, since it is larger than the sum of its proper divisors (2014339).

20147261 is a wasteful number, since it uses less digits than its factorization.

20147261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 20147261 is about 4488.5700395560. The cubic root of 20147261 is about 272.1063462831.

The spelling of 20147261 in words is "twenty million, one hundred forty-seven thousand, two hundred sixty-one".