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20871095040 = 2836522367
BaseRepresentation
bin10011011100000000…
…111010001100000000
31222212112122111000000
4103130000322030000
5320221000020130
613331004000000
71336130244405
oct233400721400
958775574000
1020871095040
118940209684
124065830000
131c77cc08a3
14101dc7a2ac
15822488260
hex4dc03a300

20871095040 has 252 divisors, whose sum is σ = 74958254784. Its totient is φ = 5565376512.

The previous prime is 20871095033. The next prime is 20871095099. The reversal of 20871095040 is 4059017802.

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 = 20871094986 and 20871095004.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 921937 + ... + 944303.

It is an arithmetic number, because the mean of its divisors is an integer number (297453392).

Almost surely, 220871095040 is an apocalyptic number.

20871095040 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 20871095040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37479127392).

20871095040 is an abundant number, since it is smaller than the sum of its proper divisors (54087159744).

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

20871095040 is an frugal number, since it uses more digits than its factorization.

20871095040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22406 (or 22377 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The spelling of 20871095040 in words is "twenty billion, eight hundred seventy-one million, ninety-five thousand, forty".