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20993084 = 227823911
BaseRepresentation
bin101000000010…
…1010000111100
31110111120002122
41100011100330
520333234314
62025542112
7343303220
oct120052074
943446078
1020993084
1110939462
127044938
134470458
142b06780
151c9a28e
hex140543c

20993084 has 24 divisors (see below), whose sum is σ = 42083328. Its totient is φ = 8976240.

The previous prime is 20993083. The next prime is 20993087. The reversal of 20993084 is 48039902.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20993083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22589 + ... + 23499.

It is an arithmetic number, because the mean of its divisors is an integer number (1753472).

Almost surely, 220993084 is an apocalyptic number.

It is an amenable number.

20993084 is an abundant number, since it is smaller than the sum of its proper divisors (21090244).

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

20993084 is a wasteful number, since it uses less digits than its factorization.

20993084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1745 (or 1743 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 20993084 is about 4581.8210353526. The cubic root of 20993084 is about 275.8621274562.

The spelling of 20993084 in words is "twenty million, nine hundred ninety-three thousand, eighty-four".

Divisors: 1 2 4 7 14 28 823 911 1646 1822 3292 3644 5761 6377 11522 12754 23044 25508 749753 1499506 2999012 5248271 10496542 20993084