20661507060 has 96 divisors (see below), whose sum is σ = 61631055360. Its totient is φ = 5156836992.

The previous prime is 20661507059. The next prime is 20661507071. The reversal of 20661507060 is 6070516602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14562 + ... + 203801.

It is an arithmetic number, because the mean of its divisors is an integer number (641990160).

Almost surely, 2^20661507060 is an apocalyptic number.

20661507060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20661507060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30815527680).

20661507060 is an abundant number, since it is smaller than the sum of its proper divisors (40969548300).

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

20661507060 is a wasteful number, since it uses less digits than its factorization.

20661507060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218477 (or 218475 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The spelling of 20661507060 in words is "twenty billion, six hundred sixty-one million, five hundred seven thousand, sixty".