20145256420 has 12 divisors (see below), whose sum is σ = 42305038524. Its totient is φ = 8058102560.

The previous prime is 20145256403. The next prime is 20145256451. The reversal of 20145256420 is 2465254102.

It can be written as a sum of positive squares in 2 ways, for example, as 11358443776 + 8786812644 = 106576^2 + 93738^2 .

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, 503631391 + ... + 503631430.

It is an arithmetic number, because the mean of its divisors is an integer number (3525419877).

Almost surely, 2^20145256420 is an apocalyptic number.

20145256420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20145256420 is an abundant number, since it is smaller than the sum of its proper divisors (22159782104).

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

20145256420 is a wasteful number, since it uses less digits than its factorization.

20145256420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007262830 (or 1007262828 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

The spelling of 20145256420 in words is "twenty billion, one hundred forty-five million, two hundred fifty-six thousand, four hundred twenty".