19901900

素因数分解:

$2^2\times 5^2\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{509}}^1$

素因数の和:563

約数の個数: 72

約数和(自身を含む): 47809440

約数和(自身を除く): 27907540

約数列:

[1, 2, 4, 5, 10, 17, 20, 23, 25, 34, 46, 50, 68, 85, 92, 100, 115, 170, 230, 340, 391, 425, 460, 509, 575, 782, 850, 1018, 1150, 1564, 1700, 1955, 2036, 2300, 2545, 3910, 5090, 7820, 8653, 9775, 10180, 11707, 12725, 17306, 19550, 23414, 25450, 34612, 39100, 43265, 46828, 50900, 58535, 86530, 117070, 173060, 199019, 216325, 234140, 292675, 398038, 432650, 585350, 796076, 865300, 995095, 1170700, 1990190, 3980380, 4975475, 9950950, 19901900]

約数ペア:

[(1, 19901900), (2, 9950950), (4, 4975475), (5, 3980380), (10, 1990190), (17, 1170700), (20, 995095), (23, 865300), (25, 796076), (34, 585350), (46, 432650), (50, 398038), (68, 292675), (85, 234140), (92, 216325), (100, 199019), (115, 173060), (170, 117070), (230, 86530), (340, 58535), (391, 50900), (425, 46828), (460, 43265), (509, 39100), (575, 34612), (782, 25450), (850, 23414), (1018, 19550), (1150, 17306), (1564, 12725), (1700, 11707), (1955, 10180), (2036, 9775), (2300, 8653), (2545, 7820), (3910, 5090)]