21541720

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{79}}^1\times {\mathrm{401}}^1$

素因数の和:508

約数の個数: 64

約数和(自身を含む): 52099200

約数和(自身を除く): 30557480

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 79, 85, 136, 158, 170, 316, 340, 395, 401, 632, 680, 790, 802, 1343, 1580, 1604, 2005, 2686, 3160, 3208, 4010, 5372, 6715, 6817, 8020, 10744, 13430, 13634, 16040, 26860, 27268, 31679, 34085, 53720, 54536, 63358, 68170, 126716, 136340, 158395, 253432, 272680, 316790, 538543, 633580, 1077086, 1267160, 2154172, 2692715, 4308344, 5385430, 10770860, 21541720]

約数ペア:

[(1, 21541720), (2, 10770860), (4, 5385430), (5, 4308344), (8, 2692715), (10, 2154172), (17, 1267160), (20, 1077086), (34, 633580), (40, 538543), (68, 316790), (79, 272680), (85, 253432), (136, 158395), (158, 136340), (170, 126716), (316, 68170), (340, 63358), (395, 54536), (401, 53720), (632, 34085), (680, 31679), (790, 27268), (802, 26860), (1343, 16040), (1580, 13634), (1604, 13430), (2005, 10744), (2686, 8020), (3160, 6817), (3208, 6715), (4010, 5372)]