21418480

素因数分解:

$2^4\times 5^1\times {\mathrm{79}}^1\times {\mathrm{3389}}^1$

素因数の和:3481

約数の個数: 40

約数和(自身を含む): 50443200

約数和(自身を除く): 29024720

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 79, 80, 158, 316, 395, 632, 790, 1264, 1580, 3160, 3389, 6320, 6778, 13556, 16945, 27112, 33890, 54224, 67780, 135560, 267731, 271120, 535462, 1070924, 1338655, 2141848, 2677310, 4283696, 5354620, 10709240, 21418480]

約数ペア:

[(1, 21418480), (2, 10709240), (4, 5354620), (5, 4283696), (8, 2677310), (10, 2141848), (16, 1338655), (20, 1070924), (40, 535462), (79, 271120), (80, 267731), (158, 135560), (316, 67780), (395, 54224), (632, 33890), (790, 27112), (1264, 16945), (1580, 13556), (3160, 6778), (3389, 6320)]