20655897494 has 16 divisors (see below), whose sum is σ = 32107798656. Its totient is φ = 9955891200.

The previous prime is 20655897439. The next prime is 20655897499. The reversal of 20655897494 is 49479855602.

It is a happy number.

It is a super-2 number, since 2×20655897494² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20655897499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 632237 + ... + 664104.

It is an arithmetic number, because the mean of its divisors is an integer number (2006737416).

Almost surely, 2^20655897494 is an apocalyptic number.

20655897494 is a deficient number, since it is larger than the sum of its proper divisors (11451901162).

20655897494 is a wasteful number, since it uses less digits than its factorization.

20655897494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296631.

The product of its (nonzero) digits is 21772800, while the sum is 59.

The spelling of 20655897494 in words is "twenty billion, six hundred fifty-five million, eight hundred ninety-seven thousand, four hundred ninety-four".