20311463 has 4 divisors (see below), whose sum is σ = 20446128. Its totient is φ = 20176800.

The previous prime is 20311439. The next prime is 20311469. The reversal of 20311463 is 36411302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20311463 - 2¹⁸ = 20049319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67106 + ... + 67407.

It is an arithmetic number, because the mean of its divisors is an integer number (5111532).

Almost surely, 2^20311463 is an apocalyptic number.

20311463 is a deficient number, since it is larger than the sum of its proper divisors (134665).

20311463 is a wasteful number, since it uses less digits than its factorization.

20311463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134664.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 20311463 is about 4506.8240480409. The cubic root of 20311463 is about 272.8435775092.

Adding to 20311463 its reverse (36411302), we get a palindrome (56722765).

The spelling of 20311463 in words is "twenty million, three hundred eleven thousand, four hundred sixty-three".