20147211 has 20 divisors (see below), whose sum is σ = 34396912. Its totient is φ = 11512368.

The previous prime is 20147207. The next prime is 20147221. The reversal of 20147211 is 11274102.

It is not a de Polignac number, because 20147211 - 2² = 20147207 is a prime.

It is a super-2 number, since 2×20147211² = 811820222157042, 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 (20147221) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 17200 + ... + 18333.

Almost surely, 2^20147211 is an apocalyptic number.

20147211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20147211 is a deficient number, since it is larger than the sum of its proper divisors (14249701).

20147211 is an equidigital number, since it uses as much as digits as its factorization.

20147211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35552 (or 35543 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 20147211 is about 4488.5644698500. The cubic root of 20147211 is about 272.1061211850.

The spelling of 20147211 in words is "twenty million, one hundred forty-seven thousand, two hundred eleven".