20673561540 has 48 divisors (see below), whose sum is σ = 58749953472. Its totient is φ = 5430665856.

The previous prime is 20673561539. The next prime is 20673561541. The reversal of 20673561540 is 4516537602.

It is an interprime number because it is at equal distance from previous prime (20673561539) and next prime (20673561541).

It is a super-2 number, since 2×20673561540² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20673561541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2567319 + ... + 2575358.

It is an arithmetic number, because the mean of its divisors is an integer number (1223957364).

Almost surely, 2^20673561540 is an apocalyptic number.

20673561540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20673561540 is an abundant number, since it is smaller than the sum of its proper divisors (38076391932).

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

20673561540 is a wasteful number, since it uses less digits than its factorization.

20673561540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5142756 (or 5142754 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 39.

The spelling of 20673561540 in words is "twenty billion, six hundred seventy-three million, five hundred sixty-one thousand, five hundred forty".