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20720754 = 23219431409
BaseRepresentation
bin100111100001…
…0110001110010
31102222201112100
41033002301302
520301031004
62020041230
7341060235
oct117026162
942881470
1020720754
111077289a
126b33216
1343a6502
142a7541c
151c44739
hex13c2c72

20720754 has 48 divisors (see below), whose sum is σ = 48391200. Its totient is φ = 6386688.

The previous prime is 20720753. The next prime is 20720759. The reversal of 20720754 is 45702702.

It is not an unprimeable number, because it can be changed into a prime (20720753) 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, 14002 + ... + 15410.

It is an arithmetic number, because the mean of its divisors is an integer number (1008150).

Almost surely, 220720754 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20720754, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24195600).

20720754 is an abundant number, since it is smaller than the sum of its proper divisors (27670446).

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

20720754 is a wasteful number, since it uses less digits than its factorization.

20720754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1479 (or 1476 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 27.

The square root of 20720754 is about 4552.0054920881. The cubic root of 20720754 is about 274.6640702486.

The spelling of 20720754 in words is "twenty million, seven hundred twenty thousand, seven hundred fifty-four".

Divisors: 1 2 3 6 9 18 19 38 43 57 86 114 129 171 258 342 387 774 817 1409 1634 2451 2818 4227 4902 7353 8454 12681 14706 25362 26771 53542 60587 80313 121174 160626 181761 240939 363522 481878 545283 1090566 1151153 2302306 3453459 6906918 10360377 20720754