21280700

素因数分解:

$2^2\times 5^2\times 7^2\times {\mathrm{43}}^1\times {\mathrm{101}}^1$

素因数の和:172

約数の個数: 108

約数和(自身を含む): 55512072

約数和(自身を除く): 34231372

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 25, 28, 35, 43, 49, 50, 70, 86, 98, 100, 101, 140, 172, 175, 196, 202, 215, 245, 301, 350, 404, 430, 490, 505, 602, 700, 707, 860, 980, 1010, 1075, 1204, 1225, 1414, 1505, 2020, 2107, 2150, 2450, 2525, 2828, 3010, 3535, 4214, 4300, 4343, 4900, 4949, 5050, 6020, 7070, 7525, 8428, 8686, 9898, 10100, 10535, 14140, 15050, 17372, 17675, 19796, 21070, 21715, 24745, 30100, 30401, 35350, 42140, 43430, 49490, 52675, 60802, 70700, 86860, 98980, 105350, 108575, 121604, 123725, 152005, 210700, 212807, 217150, 247450, 304010, 425614, 434300, 494900, 608020, 760025, 851228, 1064035, 1520050, 2128070, 3040100, 4256140, 5320175, 10640350, 21280700]

約数ペア:

[(1, 21280700), (2, 10640350), (4, 5320175), (5, 4256140), (7, 3040100), (10, 2128070), (14, 1520050), (20, 1064035), (25, 851228), (28, 760025), (35, 608020), (43, 494900), (49, 434300), (50, 425614), (70, 304010), (86, 247450), (98, 217150), (100, 212807), (101, 210700), (140, 152005), (172, 123725), (175, 121604), (196, 108575), (202, 105350), (215, 98980), (245, 86860), (301, 70700), (350, 60802), (404, 52675), (430, 49490), (490, 43430), (505, 42140), (602, 35350), (700, 30401), (707, 30100), (860, 24745), (980, 21715), (1010, 21070), (1075, 19796), (1204, 17675), (1225, 17372), (1414, 15050), (1505, 14140), (2020, 10535), (2107, 10100), (2150, 9898), (2450, 8686), (2525, 8428), (2828, 7525), (3010, 7070), (3535, 6020), (4214, 5050), (4300, 4949), (4343, 4900)]