19979740

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{197}}^1\times {\mathrm{461}}^1$

素因数の和:678

約数の個数: 48

約数和(自身を含む): 46103904

約数和(自身を除く): 26124164

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 197, 220, 394, 461, 788, 922, 985, 1844, 1970, 2167, 2305, 3940, 4334, 4610, 5071, 8668, 9220, 10142, 10835, 20284, 21670, 25355, 43340, 50710, 90817, 101420, 181634, 363268, 454085, 908170, 998987, 1816340, 1997974, 3995948, 4994935, 9989870, 19979740]

約数ペア:

[(1, 19979740), (2, 9989870), (4, 4994935), (5, 3995948), (10, 1997974), (11, 1816340), (20, 998987), (22, 908170), (44, 454085), (55, 363268), (110, 181634), (197, 101420), (220, 90817), (394, 50710), (461, 43340), (788, 25355), (922, 21670), (985, 20284), (1844, 10835), (1970, 10142), (2167, 9220), (2305, 8668), (3940, 5071), (4334, 4610)]