21451280

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{15773}}^1$

素因数の和:15803

約数の個数: 40

約数和(自身を含む): 52811352

約数和(自身を除く): 31360072

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 68, 80, 85, 136, 170, 272, 340, 680, 1360, 15773, 31546, 63092, 78865, 126184, 157730, 252368, 268141, 315460, 536282, 630920, 1072564, 1261840, 1340705, 2145128, 2681410, 4290256, 5362820, 10725640, 21451280]

約数ペア:

[(1, 21451280), (2, 10725640), (4, 5362820), (5, 4290256), (8, 2681410), (10, 2145128), (16, 1340705), (17, 1261840), (20, 1072564), (34, 630920), (40, 536282), (68, 315460), (80, 268141), (85, 252368), (136, 157730), (170, 126184), (272, 78865), (340, 63092), (680, 31546), (1360, 15773)]