20899677240 has 128 divisors (see below), whose sum is σ = 75024532800. Its totient is φ = 5144532480.

The previous prime is 20899677229. The next prime is 20899677241. The reversal of 20899677240 is 4277699802.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20899677241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 730251 + ... + 758330.

Almost surely, 2^20899677240 is an apocalyptic number.

20899677240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20899677240 is an abundant number, since it is smaller than the sum of its proper divisors (54124855560).

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

20899677240 is a wasteful number, since it uses less digits than its factorization.

20899677240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1488614 (or 1488604 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The spelling of 20899677240 in words is "twenty billion, eight hundred ninety-nine million, six hundred seventy-seven thousand, two hundred forty".