19881890

素因数分解:

$2^1\times 5^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{53}}^1\times {\mathrm{233}}^1$

素因数の和:323

約数の個数: 64

約数和(自身を含む): 43670016

約数和(自身を除く): 23788126

約数列:

[1, 2, 5, 7, 10, 14, 23, 35, 46, 53, 70, 106, 115, 161, 230, 233, 265, 322, 371, 466, 530, 742, 805, 1165, 1219, 1610, 1631, 1855, 2330, 2438, 3262, 3710, 5359, 6095, 8155, 8533, 10718, 12190, 12349, 16310, 17066, 24698, 26795, 37513, 42665, 53590, 61745, 75026, 85330, 86443, 123490, 172886, 187565, 284027, 375130, 432215, 568054, 864430, 1420135, 1988189, 2840270, 3976378, 9940945, 19881890]

約数ペア:

[(1, 19881890), (2, 9940945), (5, 3976378), (7, 2840270), (10, 1988189), (14, 1420135), (23, 864430), (35, 568054), (46, 432215), (53, 375130), (70, 284027), (106, 187565), (115, 172886), (161, 123490), (230, 86443), (233, 85330), (265, 75026), (322, 61745), (371, 53590), (466, 42665), (530, 37513), (742, 26795), (805, 24698), (1165, 17066), (1219, 16310), (1610, 12349), (1631, 12190), (1855, 10718), (2330, 8533), (2438, 8155), (3262, 6095), (3710, 5359)]