21397760

素因数分解:

$2^8\times 5^1\times {\mathrm{73}}^1\times {\mathrm{229}}^1$

素因数の和:323

約数の個数: 72

約数和(自身を含む): 52183320

約数和(自身を除く): 30785560

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 73, 80, 128, 146, 160, 229, 256, 292, 320, 365, 458, 584, 640, 730, 916, 1145, 1168, 1280, 1460, 1832, 2290, 2336, 2920, 3664, 4580, 4672, 5840, 7328, 9160, 9344, 11680, 14656, 16717, 18320, 18688, 23360, 29312, 33434, 36640, 46720, 58624, 66868, 73280, 83585, 93440, 133736, 146560, 167170, 267472, 293120, 334340, 534944, 668680, 1069888, 1337360, 2139776, 2674720, 4279552, 5349440, 10698880, 21397760]

約数ペア:

[(1, 21397760), (2, 10698880), (4, 5349440), (5, 4279552), (8, 2674720), (10, 2139776), (16, 1337360), (20, 1069888), (32, 668680), (40, 534944), (64, 334340), (73, 293120), (80, 267472), (128, 167170), (146, 146560), (160, 133736), (229, 93440), (256, 83585), (292, 73280), (320, 66868), (365, 58624), (458, 46720), (584, 36640), (640, 33434), (730, 29312), (916, 23360), (1145, 18688), (1168, 18320), (1280, 16717), (1460, 14656), (1832, 11680), (2290, 9344), (2336, 9160), (2920, 7328), (3664, 5840), (4580, 4672)]