20661266454 has 16 divisors (see below), whose sum is σ = 41326822848. Its totient is φ = 6886373832.

The previous prime is 20661266419. The next prime is 20661266471. The reversal of 20661266454 is 45466216602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114352 + ... + 233235.

It is an arithmetic number, because the mean of its divisors is an integer number (2582926428).

Almost surely, 2^20661266454 is an apocalyptic number.

20661266454 is an abundant number, since it is smaller than the sum of its proper divisors (20665556394).

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

20661266454 is a wasteful number, since it uses less digits than its factorization.

20661266454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357499.

The product of its (nonzero) digits is 414720, while the sum is 42.

The spelling of 20661266454 in words is "twenty billion, six hundred sixty-one million, two hundred sixty-six thousand, four hundred fifty-four".