21796520

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{8933}}^1$

素因数の和:9005

約数の個数: 32

約数和(自身を含む): 49851720

約数和(自身を除く): 28055200

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440, 8933, 17866, 35732, 44665, 71464, 89330, 178660, 357320, 544913, 1089826, 2179652, 2724565, 4359304, 5449130, 10898260, 21796520]

約数ペア:

[(1, 21796520), (2, 10898260), (4, 5449130), (5, 4359304), (8, 2724565), (10, 2179652), (20, 1089826), (40, 544913), (61, 357320), (122, 178660), (244, 89330), (305, 71464), (488, 44665), (610, 35732), (1220, 17866), (2440, 8933)]