20405661060 has 48 divisors (see below), whose sum is σ = 57387589056. Its totient is φ = 5417534592.

The previous prime is 20405661043. The next prime is 20405661071. The reversal of 20405661060 is 6016650402.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 735487 + ... + 762726.

It is an arithmetic number, because the mean of its divisors is an integer number (1195574772).

Almost surely, 2^20405661060 is an apocalyptic number.

20405661060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20405661060 is an abundant number, since it is smaller than the sum of its proper divisors (36981927996).

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

20405661060 is a wasteful number, since it uses less digits than its factorization.

20405661060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498452 (or 1498450 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The spelling of 20405661060 in words is "twenty billion, four hundred five million, six hundred sixty-one thousand, sixty".