20853863100 has 360 divisors, whose sum is σ = 80621173248. Its totient is φ = 4559068800.

The previous prime is 20853863099. The next prime is 20853863101. The reversal of 20853863100 is 136835802.

It is an interprime number because it is at equal distance from previous prime (20853863099) and next prime (20853863101).

It is a super-2 number, since 2×20853863100² (a number of 21 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20853863101) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 1296105 + ... + 1312095.

Almost surely, 2^20853863100 is an apocalyptic number.

20853863100 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 20853863100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40310586624).

20853863100 is an abundant number, since it is smaller than the sum of its proper divisors (59767310148).

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

20853863100 is a wasteful number, since it uses less digits than its factorization.

20853863100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16047 (or 16031 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 20853863100 in words is "twenty billion, eight hundred fifty-three million, eight hundred sixty-three thousand, one hundred".