21398240

素因数分解:

$2^5\times 5^1\times {\mathrm{17}}^1\times {\mathrm{7867}}^1$

素因数の和:7899

約数の個数: 48

約数和(自身を含む): 53533872

約数和(自身を除く): 32135632

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 32, 34, 40, 68, 80, 85, 136, 160, 170, 272, 340, 544, 680, 1360, 2720, 7867, 15734, 31468, 39335, 62936, 78670, 125872, 133739, 157340, 251744, 267478, 314680, 534956, 629360, 668695, 1069912, 1258720, 1337390, 2139824, 2674780, 4279648, 5349560, 10699120, 21398240]

約数ペア:

[(1, 21398240), (2, 10699120), (4, 5349560), (5, 4279648), (8, 2674780), (10, 2139824), (16, 1337390), (17, 1258720), (20, 1069912), (32, 668695), (34, 629360), (40, 534956), (68, 314680), (80, 267478), (85, 251744), (136, 157340), (160, 133739), (170, 125872), (272, 78670), (340, 62936), (544, 39335), (680, 31468), (1360, 15734), (2720, 7867)]