20246613840 has 120 divisors (see below), whose sum is σ = 68083181088. Its totient is φ = 5392085760.

The previous prime is 20246613833. The next prime is 20246613841. The reversal of 20246613840 is 4831664202.

20246613840 is a `hidden beast` number, since 20 + 2 + 466 + 138 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20246613795 and 20246613804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20246613841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 548775 + ... + 584505.

Almost surely, 2^20246613840 is an apocalyptic number.

20246613840 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 20246613840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34041590544).

20246613840 is an abundant number, since it is smaller than the sum of its proper divisors (47836567248).

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

20246613840 is a wasteful number, since it uses less digits than its factorization.

20246613840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36537 (or 36528 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The spelling of 20246613840 in words is "twenty billion, two hundred forty-six million, six hundred thirteen thousand, eight hundred forty".