20311045 has 16 divisors (see below), whose sum is σ = 25597440. Its totient is φ = 15451200.

The previous prime is 20311043. The next prime is 20311069. The reversal of 20311045 is 54011302.

It is not a de Polignac number, because 20311045 - 2¹ = 20311043 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8035 + ... + 10255.

It is an arithmetic number, because the mean of its divisors is an integer number (1599840).

Almost surely, 2^20311045 is an apocalyptic number.

It is an amenable number.

20311045 is a deficient number, since it is larger than the sum of its proper divisors (5286395).

20311045 is a wasteful number, since it uses less digits than its factorization.

20311045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2316.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 20311045 is about 4506.7776736822. Note that the first 3 decimals coincide. The cubic root of 20311045 is about 272.8417058337.

Adding to 20311045 its reverse (54011302), we get a palindrome (74322347).

It can be divided in two parts, 203110 and 45, that multiplied together give a triangular number (9139950 = T₄₂₇₅).

The spelling of 20311045 in words is "twenty million, three hundred eleven thousand, forty-five".