20311011 has 12 divisors (see below), whose sum is σ = 33529392. Its totient is φ = 11606256.

The previous prime is 20310973. The next prime is 20311043. The reversal of 20311011 is 11011302.

It is not a de Polignac number, because 20311011 - 2⁶ = 20310947 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20310984 and 20311002.

It is not an unprimeable number, because it can be changed into a prime (20311091) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 161136 + ... + 161261.

It is an arithmetic number, because the mean of its divisors is an integer number (2794116).

Almost surely, 2^20311011 is an apocalyptic number.

20311011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20311011 is a deficient number, since it is larger than the sum of its proper divisors (13218381).

20311011 is a wasteful number, since it uses less digits than its factorization.

20311011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322410 (or 322407 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 20311011 is about 4506.7739015841. The cubic root of 20311011 is about 272.8415535911.

Adding to 20311011 its reverse (11011302), we get a palindrome (31322313).

The spelling of 20311011 in words is "twenty million, three hundred eleven thousand, eleven".