20899621729374 has 32 divisors (see below), whose sum is σ = 41958451132416. Its totient is φ = 6940055611200.

The previous prime is 20899621729351. The next prime is 20899621729423. The reversal of 20899621729374 is 47392712699802.

It is a junction number, because it is equal to n+sod(n) for n = 20899621729299 and 20899621729308.

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 15 ways as a sum of consecutive naturals, for example, 4521342 + ... + 7889345.

It is an arithmetic number, because the mean of its divisors is an integer number (1311201597888).

Almost surely, 2^{20899621729374} is an apocalyptic number.

20899621729374 is an abundant number, since it is smaller than the sum of its proper divisors (21058829403042).

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

20899621729374 is a wasteful number, since it uses less digits than its factorization.

20899621729374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12411760.

The product of its (nonzero) digits is 164602368, while the sum is 69.

The spelling of 20899621729374 in words is "twenty trillion, eight hundred ninety-nine billion, six hundred twenty-one million, seven hundred twenty-nine thousand, three hundred seventy-four".