20454521140 has 12 divisors (see below), whose sum is σ = 42954494436. Its totient is φ = 8181808448.

The previous prime is 20454521099. The next prime is 20454521147. The reversal of 20454521140 is 4112545402.

It can be written as a sum of positive squares in 2 ways, for example, as 9013223844 + 11441297296 = 94938^2 + 106964^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20454521099 and 20454521108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20454521147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 511363009 + ... + 511363048.

It is an arithmetic number, because the mean of its divisors is an integer number (3579541203).

Almost surely, 2^20454521140 is an apocalyptic number.

20454521140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20454521140 is an abundant number, since it is smaller than the sum of its proper divisors (22499973296).

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

20454521140 is a wasteful number, since it uses less digits than its factorization.

20454521140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022726066 (or 1022726064 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

The spelling of 20454521140 in words is "twenty billion, four hundred fifty-four million, five hundred twenty-one thousand, one hundred forty".