20297648891520 has 7680 divisors, whose sum is σ = 111048497683200. Its totient is φ = 3451319746560.

The previous prime is 20297648891491. The next prime is 20297648891543. The reversal of 20297648891520 is 2519884679202.

20297648891520 is a `hidden beast` number, since 2 + 0 + 29 + 7 + 6 + 4 + 8 + 89 + 1 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 959 ways as a sum of consecutive naturals, for example, 117327450154 + ... + 117327450326.

Almost surely, 2^{20297648891520} is an apocalyptic number.

20297648891520 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 20297648891520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55524248841600).

20297648891520 is an abundant number, since it is smaller than the sum of its proper divisors (90750848791680).

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

20297648891520 is a wasteful number, since it uses less digits than its factorization.

20297648891520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278 (or 250 counting only the distinct ones).

The product of its (nonzero) digits is 34836480, while the sum is 63.

The spelling of 20297648891520 in words is "twenty trillion, two hundred ninety-seven billion, six hundred forty-eight million, eight hundred ninety-one thousand, five hundred twenty".