20142455440 has 40 divisors (see below), whose sum is σ = 49585989240. Its totient is φ = 7583041536.

The previous prime is 20142455401. The next prime is 20142455447. The reversal of 20142455440 is 4455424102.

It can be written as a sum of positive squares in 4 ways, for example, as 6292931584 + 13849523856 = 79328^2 + 117684^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×20142455440² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20142455447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7403955 + ... + 7406674.

It is an arithmetic number, because the mean of its divisors is an integer number (1239649731).

Almost surely, 2^20142455440 is an apocalyptic number.

20142455440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20142455440 is an abundant number, since it is smaller than the sum of its proper divisors (29443533800).

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

20142455440 is a wasteful number, since it uses less digits than its factorization.

20142455440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14810659 (or 14810653 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 31.

Adding to 20142455440 its reverse (4455424102), we get a palindrome (24597879542).

The spelling of 20142455440 in words is "twenty billion, one hundred forty-two million, four hundred fifty-five thousand, four hundred forty".