20520355425424 has 20 divisors (see below), whose sum is σ = 39800620030444. Its totient is φ = 10249227675648.

The previous prime is 20520355425397. The next prime is 20520355425461. The reversal of 20520355425424 is 42452455302502.

It can be written as a sum of positive squares in 2 ways, for example, as 4241293113600 + 16279062311824 = 2059440^2 + 4034732^2 .

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, 684361857 + ... + 684391840.

Almost surely, 2^{20520355425424} is an apocalyptic number.

It is an amenable number.

20520355425424 is a deficient number, since it is larger than the sum of its proper divisors (19280264605020).

20520355425424 is a wasteful number, since it uses less digits than its factorization.

20520355425424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368754642 (or 1368754636 counting only the distinct ones).

The product of its (nonzero) digits is 1920000, while the sum is 43.

The spelling of 20520355425424 in words is "twenty trillion, five hundred twenty billion, three hundred fifty-five million, four hundred twenty-five thousand, four hundred twenty-four".