20990720

素因数分解:

$2^8\times 5^1\times {\mathrm{23}}^2\times {\mathrm{31}}^1$

素因数の和:98

約数の個数: 108

約数和(自身を含む): 54255936

約数和(自身を除く): 33265216

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 23, 31, 32, 40, 46, 62, 64, 80, 92, 115, 124, 128, 155, 160, 184, 230, 248, 256, 310, 320, 368, 460, 496, 529, 620, 640, 713, 736, 920, 992, 1058, 1240, 1280, 1426, 1472, 1840, 1984, 2116, 2480, 2645, 2852, 2944, 3565, 3680, 3968, 4232, 4960, 5290, 5704, 5888, 7130, 7360, 7936, 8464, 9920, 10580, 11408, 14260, 14720, 16399, 16928, 19840, 21160, 22816, 28520, 29440, 32798, 33856, 39680, 42320, 45632, 57040, 65596, 67712, 81995, 84640, 91264, 114080, 131192, 135424, 163990, 169280, 182528, 228160, 262384, 327980, 338560, 456320, 524768, 655960, 677120, 912640, 1049536, 1311920, 2099072, 2623840, 4198144, 5247680, 10495360, 20990720]

約数ペア:

[(1, 20990720), (2, 10495360), (4, 5247680), (5, 4198144), (8, 2623840), (10, 2099072), (16, 1311920), (20, 1049536), (23, 912640), (31, 677120), (32, 655960), (40, 524768), (46, 456320), (62, 338560), (64, 327980), (80, 262384), (92, 228160), (115, 182528), (124, 169280), (128, 163990), (155, 135424), (160, 131192), (184, 114080), (230, 91264), (248, 84640), (256, 81995), (310, 67712), (320, 65596), (368, 57040), (460, 45632), (496, 42320), (529, 39680), (620, 33856), (640, 32798), (713, 29440), (736, 28520), (920, 22816), (992, 21160), (1058, 19840), (1240, 16928), (1280, 16399), (1426, 14720), (1472, 14260), (1840, 11408), (1984, 10580), (2116, 9920), (2480, 8464), (2645, 7936), (2852, 7360), (2944, 7130), (3565, 5888), (3680, 5704), (3968, 5290), (4232, 4960)]