20498667840 has 448 divisors, whose sum is σ = 84344256000. Its totient is φ = 4684732416.

The previous prime is 20498667829. The next prime is 20498667863. The reversal of 20498667840 is 4876689402.

20498667840 is a `hidden beast` number, since 20 + 498 + 66 + 78 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (448).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2960062 + ... + 2966978.

Almost surely, 2^20498667840 is an apocalyptic number.

20498667840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20498667840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42172128000).

20498667840 is an abundant number, since it is smaller than the sum of its proper divisors (63845588160).

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

20498667840 is an equidigital number, since it uses as much as digits as its factorization.

20498667840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6964 (or 6934 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 54.

The spelling of 20498667840 in words is "twenty billion, four hundred ninety-eight million, six hundred sixty-seven thousand, eight hundred forty".