20915960

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{73}}^1$

素因数の和:145

約数の個数: 128

約数和(自身を含む): 55944000

約数和(自身を除く): 35028040

約数列:

[1, 2, 4, 5, 8, 10, 13, 19, 20, 26, 29, 38, 40, 52, 58, 65, 73, 76, 95, 104, 116, 130, 145, 146, 152, 190, 232, 247, 260, 290, 292, 365, 377, 380, 494, 520, 551, 580, 584, 730, 754, 760, 949, 988, 1102, 1160, 1235, 1387, 1460, 1508, 1885, 1898, 1976, 2117, 2204, 2470, 2755, 2774, 2920, 3016, 3770, 3796, 4234, 4408, 4745, 4940, 5510, 5548, 6935, 7163, 7540, 7592, 8468, 9490, 9880, 10585, 11020, 11096, 13870, 14326, 15080, 16936, 18031, 18980, 21170, 22040, 27521, 27740, 28652, 35815, 36062, 37960, 40223, 42340, 55042, 55480, 57304, 71630, 72124, 80446, 84680, 90155, 110084, 137605, 143260, 144248, 160892, 180310, 201115, 220168, 275210, 286520, 321784, 360620, 402230, 522899, 550420, 721240, 804460, 1045798, 1100840, 1608920, 2091596, 2614495, 4183192, 5228990, 10457980, 20915960]

約数ペア:

[(1, 20915960), (2, 10457980), (4, 5228990), (5, 4183192), (8, 2614495), (10, 2091596), (13, 1608920), (19, 1100840), (20, 1045798), (26, 804460), (29, 721240), (38, 550420), (40, 522899), (52, 402230), (58, 360620), (65, 321784), (73, 286520), (76, 275210), (95, 220168), (104, 201115), (116, 180310), (130, 160892), (145, 144248), (146, 143260), (152, 137605), (190, 110084), (232, 90155), (247, 84680), (260, 80446), (290, 72124), (292, 71630), (365, 57304), (377, 55480), (380, 55042), (494, 42340), (520, 40223), (551, 37960), (580, 36062), (584, 35815), (730, 28652), (754, 27740), (760, 27521), (949, 22040), (988, 21170), (1102, 18980), (1160, 18031), (1235, 16936), (1387, 15080), (1460, 14326), (1508, 13870), (1885, 11096), (1898, 11020), (1976, 10585), (2117, 9880), (2204, 9490), (2470, 8468), (2755, 7592), (2774, 7540), (2920, 7163), (3016, 6935), (3770, 5548), (3796, 5510), (4234, 4940), (4408, 4745)]