20211465 has 16 divisors (see below), whose sum is σ = 32478336. Its totient is φ = 10732800.

The previous prime is 20211461. The next prime is 20211469. The reversal of 20211465 is 56411202.

It is an interprime number because it is at equal distance from previous prime (20211461) and next prime (20211469).

It is not a de Polignac number, because 20211465 - 2² = 20211461 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20211461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 820 + ... + 6410.

It is an arithmetic number, because the mean of its divisors is an integer number (2029896).

Almost surely, 2^20211465 is an apocalyptic number.

It is an amenable number.

20211465 is a deficient number, since it is larger than the sum of its proper divisors (12266871).

20211465 is a wasteful number, since it uses less digits than its factorization.

20211465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5840.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 20211465 is about 4495.7162944296. The cubic root of 20211465 is about 272.3950834780.

Adding to 20211465 its reverse (56411202), we get a palindrome (76622667).

It can be divided in two parts, 2021 and 1465, that added together give a triangular number (3486 = T₈₃).

The spelling of 20211465 in words is "twenty million, two hundred eleven thousand, four hundred sixty-five".