20465977648 has 20 divisors (see below), whose sum is σ = 39770506360. Its totient is φ = 10202621184.

The previous prime is 20465977627. The next prime is 20465977669. The reversal of 20465977648 is 84677956402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20465977627) and next prime (20465977669).

It is a super-2 number, since 2×20465977648² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20465977592 and 20465977601.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1892418 + ... + 1903201.

It is an arithmetic number, because the mean of its divisors is an integer number (1988525318).

Almost surely, 2^20465977648 is an apocalyptic number.

It is an amenable number.

20465977648 is a deficient number, since it is larger than the sum of its proper divisors (19304528712).

20465977648 is a wasteful number, since it uses less digits than its factorization.

20465977648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3795964 (or 3795958 counting only the distinct ones).

The product of its (nonzero) digits is 20321280, while the sum is 58.

The spelling of 20465977648 in words is "twenty billion, four hundred sixty-five million, nine hundred seventy-seven thousand, six hundred forty-eight".