19787920

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{79}}^1\times {\mathrm{101}}^1$

素因数の和:224

約数の個数: 80

約数和(自身を含む): 48568320

約数和(自身を除く): 28780400

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 62, 79, 80, 101, 124, 155, 158, 202, 248, 310, 316, 395, 404, 496, 505, 620, 632, 790, 808, 1010, 1240, 1264, 1580, 1616, 2020, 2449, 2480, 3131, 3160, 4040, 4898, 6262, 6320, 7979, 8080, 9796, 12245, 12524, 15655, 15958, 19592, 24490, 25048, 31310, 31916, 39184, 39895, 48980, 50096, 62620, 63832, 79790, 97960, 125240, 127664, 159580, 195920, 247349, 250480, 319160, 494698, 638320, 989396, 1236745, 1978792, 2473490, 3957584, 4946980, 9893960, 19787920]

約数ペア:

[(1, 19787920), (2, 9893960), (4, 4946980), (5, 3957584), (8, 2473490), (10, 1978792), (16, 1236745), (20, 989396), (31, 638320), (40, 494698), (62, 319160), (79, 250480), (80, 247349), (101, 195920), (124, 159580), (155, 127664), (158, 125240), (202, 97960), (248, 79790), (310, 63832), (316, 62620), (395, 50096), (404, 48980), (496, 39895), (505, 39184), (620, 31916), (632, 31310), (790, 25048), (808, 24490), (1010, 19592), (1240, 15958), (1264, 15655), (1580, 12524), (1616, 12245), (2020, 9796), (2449, 8080), (2480, 7979), (3131, 6320), (3160, 6262), (4040, 4898)]