20701005515551 has 8 divisors (see below), whose sum is σ = 20752961325408. Its totient is φ = 20649051360000.

The previous prime is 20701005515537. The next prime is 20701005515563. The reversal of 20701005515551 is 15551550010702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20701005515551 - 2⁷ = 20701005515423 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20701005515551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20701005515051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26905086 + ... + 27663796.

It is an arithmetic number, because the mean of its divisors is an integer number (2594120165676).

Almost surely, 2^{20701005515551} is an apocalyptic number.

20701005515551 is a deficient number, since it is larger than the sum of its proper divisors (51955809857).

20701005515551 is an equidigital number, since it uses as much as digits as its factorization.

20701005515551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827153.

The product of its (nonzero) digits is 43750, while the sum is 37.

The spelling of 20701005515551 in words is "twenty trillion, seven hundred one billion, five million, five hundred fifteen thousand, five hundred fifty-one".