21285358400

素因数分解:

$2^6\times 5^2\times {\mathrm{199}}^1\times {\mathrm{66851}}^1$

素因数の和:67072

約数の個数: 84

約数和(自身を含む): 52639264800

約数和(自身を除く): 31353906400

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 160, 199, 200, 320, 398, 400, 796, 800, 995, 1592, 1600, 1990, 3184, 3980, 4975, 6368, 7960, 9950, 12736, 15920, 19900, 31840, 39800, 63680, 66851, 79600, 133702, 159200, 267404, 318400, 334255, 534808, 668510, 1069616, 1337020, 1671275, 2139232, 2674040, 3342550, 4278464, 5348080, 6685100, 10696160, 13303349, 13370200, 21392320, 26606698, 26740400, 53213396, 53480800, 66516745, 106426792, 106961600, 133033490, 212853584, 266066980, 332583725, 425707168, 532133960, 665167450, 851414336, 1064267920, 1330334900, 2128535840, 2660669800, 4257071680, 5321339600, 10642679200, 21285358400]

約数ペア:

[(1, 21285358400), (2, 10642679200), (4, 5321339600), (5, 4257071680), (8, 2660669800), (10, 2128535840), (16, 1330334900), (20, 1064267920), (25, 851414336), (32, 665167450), (40, 532133960), (50, 425707168), (64, 332583725), (80, 266066980), (100, 212853584), (160, 133033490), (199, 106961600), (200, 106426792), (320, 66516745), (398, 53480800), (400, 53213396), (796, 26740400), (800, 26606698), (995, 21392320), (1592, 13370200), (1600, 13303349), (1990, 10696160), (3184, 6685100), (3980, 5348080), (4975, 4278464), (6368, 3342550), (7960, 2674040), (9950, 2139232), (12736, 1671275), (15920, 1337020), (19900, 1069616), (31840, 668510), (39800, 534808), (63680, 334255), (66851, 318400), (79600, 267404), (133702, 159200)]