21809120

素因数分解:

$2^5\times 5^1\times {\mathrm{31}}^1\times {\mathrm{4397}}^1$

素因数の和:4443

約数の個数: 48

約数和(自身を含む): 53198208

約数和(自身を除く): 31389088

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 80, 124, 155, 160, 248, 310, 496, 620, 992, 1240, 2480, 4397, 4960, 8794, 17588, 21985, 35176, 43970, 70352, 87940, 136307, 140704, 175880, 272614, 351760, 545228, 681535, 703520, 1090456, 1363070, 2180912, 2726140, 4361824, 5452280, 10904560, 21809120]

約数ペア:

[(1, 21809120), (2, 10904560), (4, 5452280), (5, 4361824), (8, 2726140), (10, 2180912), (16, 1363070), (20, 1090456), (31, 703520), (32, 681535), (40, 545228), (62, 351760), (80, 272614), (124, 175880), (155, 140704), (160, 136307), (248, 87940), (310, 70352), (496, 43970), (620, 35176), (992, 21985), (1240, 17588), (2480, 8794), (4397, 4960)]