20311130540 has 12 divisors (see below), whose sum is σ = 42653374176. Its totient is φ = 8124452208.

The previous prime is 20311130503. The next prime is 20311130597. The reversal of 20311130540 is 4503111302.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1015556527 = 20311130540 / (2 + 0 + 3 + 1 + 1 + 1 + 3 + 0 + 5 + 4 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 507778244 + ... + 507778283.

It is an arithmetic number, because the mean of its divisors is an integer number (3554447848).

Almost surely, 2^20311130540 is an apocalyptic number.

20311130540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20311130540 is an abundant number, since it is smaller than the sum of its proper divisors (22342243636).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20311130540 is a wasteful number, since it uses less digits than its factorization.

20311130540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015556536 (or 1015556534 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 20311130540 its reverse (4503111302), we get a palindrome (24814241842).

The spelling of 20311130540 in words is "twenty billion, three hundred eleven million, one hundred thirty thousand, five hundred forty".