20743660

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{61}}^1\times {\mathrm{347}}^1$

素因数の和:431

約数の個数: 72

約数和(自身を含む): 51652944

約数和(自身を除く): 30909284

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 61, 70, 98, 122, 140, 196, 244, 245, 305, 347, 427, 490, 610, 694, 854, 980, 1220, 1388, 1708, 1735, 2135, 2429, 2989, 3470, 4270, 4858, 5978, 6940, 8540, 9716, 11956, 12145, 14945, 17003, 21167, 24290, 29890, 34006, 42334, 48580, 59780, 68012, 84668, 85015, 105835, 148169, 170030, 211670, 296338, 340060, 423340, 592676, 740845, 1037183, 1481690, 2074366, 2963380, 4148732, 5185915, 10371830, 20743660]

約数ペア:

[(1, 20743660), (2, 10371830), (4, 5185915), (5, 4148732), (7, 2963380), (10, 2074366), (14, 1481690), (20, 1037183), (28, 740845), (35, 592676), (49, 423340), (61, 340060), (70, 296338), (98, 211670), (122, 170030), (140, 148169), (196, 105835), (244, 85015), (245, 84668), (305, 68012), (347, 59780), (427, 48580), (490, 42334), (610, 34006), (694, 29890), (854, 24290), (980, 21167), (1220, 17003), (1388, 14945), (1708, 12145), (1735, 11956), (2135, 9716), (2429, 8540), (2989, 6940), (3470, 5978), (4270, 4858)]