20939320

素因数分解:

$2^3\times 5^1\times {\mathrm{71}}^1\times {\mathrm{73}}^1\times {\mathrm{101}}^1$

素因数の和:256

約数の個数: 64

約数和(自身を含む): 48911040

約数和(自身を除く): 27971720

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 71, 73, 101, 142, 146, 202, 284, 292, 355, 365, 404, 505, 568, 584, 710, 730, 808, 1010, 1420, 1460, 2020, 2840, 2920, 4040, 5183, 7171, 7373, 10366, 14342, 14746, 20732, 25915, 28684, 29492, 35855, 36865, 41464, 51830, 57368, 58984, 71710, 73730, 103660, 143420, 147460, 207320, 286840, 294920, 523483, 1046966, 2093932, 2617415, 4187864, 5234830, 10469660, 20939320]

約数ペア:

[(1, 20939320), (2, 10469660), (4, 5234830), (5, 4187864), (8, 2617415), (10, 2093932), (20, 1046966), (40, 523483), (71, 294920), (73, 286840), (101, 207320), (142, 147460), (146, 143420), (202, 103660), (284, 73730), (292, 71710), (355, 58984), (365, 57368), (404, 51830), (505, 41464), (568, 36865), (584, 35855), (710, 29492), (730, 28684), (808, 25915), (1010, 20732), (1420, 14746), (1460, 14342), (2020, 10366), (2840, 7373), (2920, 7171), (4040, 5183)]