20146256560 has 40 divisors (see below), whose sum is σ = 46990715616. Its totient is φ = 8032581120.

The previous prime is 20146256539. The next prime is 20146256573. The reversal of 20146256560 is 6565264102.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 379989 + ... + 429748.

Almost surely, 2^20146256560 is an apocalyptic number.

20146256560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20146256560 is an abundant number, since it is smaller than the sum of its proper divisors (26844459056).

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

20146256560 is a wasteful number, since it uses less digits than its factorization.

20146256560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810061 (or 810055 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 20146256560 in words is "twenty billion, one hundred forty-six million, two hundred fifty-six thousand, five hundred sixty".