20287588461 has 8 divisors (see below), whose sum is σ = 30914420544. Its totient is φ = 11592907680.

The previous prime is 20287588441. The next prime is 20287588499. The reversal of 20287588461 is 16488578202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20287588461 - 2¹¹ = 20287586413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20287588421) 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, 483037800 + ... + 483037841.

It is an arithmetic number, because the mean of its divisors is an integer number (3864302568).

Almost surely, 2^20287588461 is an apocalyptic number.

20287588461 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20287588461 is a deficient number, since it is larger than the sum of its proper divisors (10626832083).

20287588461 is an equidigital number, since it uses as much as digits as its factorization.

20287588461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966075651.

The product of its (nonzero) digits is 1720320, while the sum is 51.

The spelling of 20287588461 in words is "twenty billion, two hundred eighty-seven million, five hundred eighty-eight thousand, four hundred sixty-one".