20989695205440 has 224 divisors, whose sum is σ = 79742902296960. Its totient is φ = 5166694176768.

The previous prime is 20989695205387. The next prime is 20989695205469. The reversal of 20989695205440 is 4450259698902.

20989695205440 is a `hidden beast` number, since 2 + 0 + 9 + 8 + 9 + 69 + 5 + 20 + 544 + 0 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 93324714 + ... + 93549353.

It is an arithmetic number, because the mean of its divisors is an integer number (355995099540).

Almost surely, 2^{20989695205440} is an apocalyptic number.

20989695205440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20989695205440 is an abundant number, since it is smaller than the sum of its proper divisors (58753207091520).

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

20989695205440 is a wasteful number, since it uses less digits than its factorization.

20989695205440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186874106 (or 186874090 counting only the distinct ones).

The product of its (nonzero) digits is 55987200, while the sum is 63.

The spelling of 20989695205440 in words is "twenty trillion, nine hundred eighty-nine billion, six hundred ninety-five million, two hundred five thousand, four hundred forty".