21071980

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{47}}^1\times {\mathrm{773}}^1$

素因数の和:858

約数の個数: 48

約数和(自身を含む): 46811520

約数和(自身を除く): 25739540

約数列:

[1, 2, 4, 5, 10, 20, 29, 47, 58, 94, 116, 145, 188, 235, 290, 470, 580, 773, 940, 1363, 1546, 2726, 3092, 3865, 5452, 6815, 7730, 13630, 15460, 22417, 27260, 36331, 44834, 72662, 89668, 112085, 145324, 181655, 224170, 363310, 448340, 726620, 1053599, 2107198, 4214396, 5267995, 10535990, 21071980]

約数ペア:

[(1, 21071980), (2, 10535990), (4, 5267995), (5, 4214396), (10, 2107198), (20, 1053599), (29, 726620), (47, 448340), (58, 363310), (94, 224170), (116, 181655), (145, 145324), (188, 112085), (235, 89668), (290, 72662), (470, 44834), (580, 36331), (773, 27260), (940, 22417), (1363, 15460), (1546, 13630), (2726, 7730), (3092, 6815), (3865, 5452)]