20306511140 has 12 divisors (see below), whose sum is σ = 42643673436. Its totient is φ = 8122604448.

The previous prime is 20306511139. The next prime is 20306511143. The reversal of 20306511140 is 4111560302.

It can be written as a sum of positive squares in 2 ways, for example, as 9313408036 + 10993103104 = 96506^2 + 104848^2 .

It is not an unprimeable number, because it can be changed into a prime (20306511143) 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, 507662759 + ... + 507662798.

It is an arithmetic number, because the mean of its divisors is an integer number (3553639453).

Almost surely, 2^20306511140 is an apocalyptic number.

20306511140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20306511140 is an abundant number, since it is smaller than the sum of its proper divisors (22337162296).

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

20306511140 is a wasteful number, since it uses less digits than its factorization.

20306511140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015325566 (or 1015325564 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The spelling of 20306511140 in words is "twenty billion, three hundred six million, five hundred eleven thousand, one hundred forty".