21250580

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{47}}^2$

素因数の和:153

約数の個数: 72

約数和(自身を含む): 50430408

約数和(自身を除く): 29179828

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 37, 47, 52, 65, 74, 94, 130, 148, 185, 188, 235, 260, 370, 470, 481, 611, 740, 940, 962, 1222, 1739, 1924, 2209, 2405, 2444, 3055, 3478, 4418, 4810, 6110, 6956, 8695, 8836, 9620, 11045, 12220, 17390, 22090, 22607, 28717, 34780, 44180, 45214, 57434, 81733, 90428, 113035, 114868, 143585, 163466, 226070, 287170, 326932, 408665, 452140, 574340, 817330, 1062529, 1634660, 2125058, 4250116, 5312645, 10625290, 21250580]

約数ペア:

[(1, 21250580), (2, 10625290), (4, 5312645), (5, 4250116), (10, 2125058), (13, 1634660), (20, 1062529), (26, 817330), (37, 574340), (47, 452140), (52, 408665), (65, 326932), (74, 287170), (94, 226070), (130, 163466), (148, 143585), (185, 114868), (188, 113035), (235, 90428), (260, 81733), (370, 57434), (470, 45214), (481, 44180), (611, 34780), (740, 28717), (940, 22607), (962, 22090), (1222, 17390), (1739, 12220), (1924, 11045), (2209, 9620), (2405, 8836), (2444, 8695), (3055, 6956), (3478, 6110), (4418, 4810)]