20615403960 has 320 divisors, whose sum is σ = 71508096000. Its totient is φ = 5323014144.

The previous prime is 20615403943. The next prime is 20615403979. The reversal of 20615403960 is 6930451602.

It is a happy number.

20615403960 is a `hidden beast` number, since 2 + 0 + 615 + 4 + 0 + 39 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 45913816 + ... + 45914264.

It is an arithmetic number, because the mean of its divisors is an integer number (223462800).

Almost surely, 2^20615403960 is an apocalyptic number.

20615403960 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 20615403960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35754048000).

20615403960 is an abundant number, since it is smaller than the sum of its proper divisors (50892692040).

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

20615403960 is a wasteful number, since it uses less digits than its factorization.

20615403960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892 (or 879 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The spelling of 20615403960 in words is "twenty billion, six hundred fifteen million, four hundred three thousand, nine hundred sixty".