21405040

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{15739}}^1$

素因数の和:15769

約数の個数: 40

約数和(自身を含む): 52697520

約数和(自身を除く): 31292480

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 68, 80, 85, 136, 170, 272, 340, 680, 1360, 15739, 31478, 62956, 78695, 125912, 157390, 251824, 267563, 314780, 535126, 629560, 1070252, 1259120, 1337815, 2140504, 2675630, 4281008, 5351260, 10702520, 21405040]

約数ペア:

[(1, 21405040), (2, 10702520), (4, 5351260), (5, 4281008), (8, 2675630), (10, 2140504), (16, 1337815), (17, 1259120), (20, 1070252), (34, 629560), (40, 535126), (68, 314780), (80, 267563), (85, 251824), (136, 157390), (170, 125912), (272, 78695), (340, 62956), (680, 31478), (1360, 15739)]