21078980

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{251}}^1$

素因数の和:309

約数の個数: 96

約数和(自身を含む): 53343360

約数和(自身を除く): 32264380

約数列:

[1, 2, 4, 5, 10, 13, 17, 19, 20, 26, 34, 38, 52, 65, 68, 76, 85, 95, 130, 170, 190, 221, 247, 251, 260, 323, 340, 380, 442, 494, 502, 646, 884, 988, 1004, 1105, 1235, 1255, 1292, 1615, 2210, 2470, 2510, 3230, 3263, 4199, 4267, 4420, 4769, 4940, 5020, 6460, 6526, 8398, 8534, 9538, 13052, 16315, 16796, 17068, 19076, 20995, 21335, 23845, 32630, 41990, 42670, 47690, 55471, 61997, 65260, 81073, 83980, 85340, 95380, 110942, 123994, 162146, 221884, 247988, 277355, 309985, 324292, 405365, 554710, 619970, 810730, 1053949, 1109420, 1239940, 1621460, 2107898, 4215796, 5269745, 10539490, 21078980]

約数ペア:

[(1, 21078980), (2, 10539490), (4, 5269745), (5, 4215796), (10, 2107898), (13, 1621460), (17, 1239940), (19, 1109420), (20, 1053949), (26, 810730), (34, 619970), (38, 554710), (52, 405365), (65, 324292), (68, 309985), (76, 277355), (85, 247988), (95, 221884), (130, 162146), (170, 123994), (190, 110942), (221, 95380), (247, 85340), (251, 83980), (260, 81073), (323, 65260), (340, 61997), (380, 55471), (442, 47690), (494, 42670), (502, 41990), (646, 32630), (884, 23845), (988, 21335), (1004, 20995), (1105, 19076), (1235, 17068), (1255, 16796), (1292, 16315), (1615, 13052), (2210, 9538), (2470, 8534), (2510, 8398), (3230, 6526), (3263, 6460), (4199, 5020), (4267, 4940), (4420, 4769)]