21345740

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{149}}^1$

素因数の和:219

約数の個数: 96

約数和(自身を含む): 52920000

約数和(自身を除く): 31574260

約数列:

[1, 2, 4, 5, 10, 13, 19, 20, 26, 29, 38, 52, 58, 65, 76, 95, 116, 130, 145, 149, 190, 247, 260, 290, 298, 377, 380, 494, 551, 580, 596, 745, 754, 988, 1102, 1235, 1490, 1508, 1885, 1937, 2204, 2470, 2755, 2831, 2980, 3770, 3874, 4321, 4940, 5510, 5662, 7163, 7540, 7748, 8642, 9685, 11020, 11324, 14155, 14326, 17284, 19370, 21605, 28310, 28652, 35815, 36803, 38740, 43210, 56173, 56620, 71630, 73606, 82099, 86420, 112346, 143260, 147212, 164198, 184015, 224692, 280865, 328396, 368030, 410495, 561730, 736060, 820990, 1067287, 1123460, 1641980, 2134574, 4269148, 5336435, 10672870, 21345740]

約数ペア:

[(1, 21345740), (2, 10672870), (4, 5336435), (5, 4269148), (10, 2134574), (13, 1641980), (19, 1123460), (20, 1067287), (26, 820990), (29, 736060), (38, 561730), (52, 410495), (58, 368030), (65, 328396), (76, 280865), (95, 224692), (116, 184015), (130, 164198), (145, 147212), (149, 143260), (190, 112346), (247, 86420), (260, 82099), (290, 73606), (298, 71630), (377, 56620), (380, 56173), (494, 43210), (551, 38740), (580, 36803), (596, 35815), (745, 28652), (754, 28310), (988, 21605), (1102, 19370), (1235, 17284), (1490, 14326), (1508, 14155), (1885, 11324), (1937, 11020), (2204, 9685), (2470, 8642), (2755, 7748), (2831, 7540), (2980, 7163), (3770, 5662), (3874, 5510), (4321, 4940)]