20400211 has 8 divisors (see below), whose sum is σ = 22019760. Its totient is φ = 18787872.

The previous prime is 20400197. The next prime is 20400239. The reversal of 20400211 is 11200402.

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

It is a cyclic number.

It is not a de Polignac number, because 20400211 - 2⁵ = 20400179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20400271) 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, 5076 + ... + 8158.

It is an arithmetic number, because the mean of its divisors is an integer number (2752470).

Almost surely, 2^20400211 is an apocalyptic number.

20400211 is a deficient number, since it is larger than the sum of its proper divisors (1619549).

20400211 is a wasteful number, since it uses less digits than its factorization.

20400211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3605.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 20400211 is about 4516.6592742867. The cubic root of 20400211 is about 273.2403836572.

Adding to 20400211 its reverse (11200402), we get a palindrome (31600613).

The spelling of 20400211 in words is "twenty million, four hundred thousand, two hundred eleven".