21037840

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{499}}^1$

素因数の和:560

約数の個数: 80

約数和(自身を含む): 53568000

約数和(自身を除く): 32530160

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 31, 34, 40, 62, 68, 80, 85, 124, 136, 155, 170, 248, 272, 310, 340, 496, 499, 527, 620, 680, 998, 1054, 1240, 1360, 1996, 2108, 2480, 2495, 2635, 3992, 4216, 4990, 5270, 7984, 8432, 8483, 9980, 10540, 15469, 16966, 19960, 21080, 30938, 33932, 39920, 42160, 42415, 61876, 67864, 77345, 84830, 123752, 135728, 154690, 169660, 247504, 262973, 309380, 339320, 525946, 618760, 678640, 1051892, 1237520, 1314865, 2103784, 2629730, 4207568, 5259460, 10518920, 21037840]

約数ペア:

[(1, 21037840), (2, 10518920), (4, 5259460), (5, 4207568), (8, 2629730), (10, 2103784), (16, 1314865), (17, 1237520), (20, 1051892), (31, 678640), (34, 618760), (40, 525946), (62, 339320), (68, 309380), (80, 262973), (85, 247504), (124, 169660), (136, 154690), (155, 135728), (170, 123752), (248, 84830), (272, 77345), (310, 67864), (340, 61876), (496, 42415), (499, 42160), (527, 39920), (620, 33932), (680, 30938), (998, 21080), (1054, 19960), (1240, 16966), (1360, 15469), (1996, 10540), (2108, 9980), (2480, 8483), (2495, 8432), (2635, 7984), (3992, 5270), (4216, 4990)]