21565720

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{2131}}^1$

素因数の和:2176

約数の個数: 64

約数和(自身を含む): 55261440

約数和(自身を除く): 33695720

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 23, 40, 44, 46, 55, 88, 92, 110, 115, 184, 220, 230, 253, 440, 460, 506, 920, 1012, 1265, 2024, 2131, 2530, 4262, 5060, 8524, 10120, 10655, 17048, 21310, 23441, 42620, 46882, 49013, 85240, 93764, 98026, 117205, 187528, 196052, 234410, 245065, 392104, 468820, 490130, 539143, 937640, 980260, 1078286, 1960520, 2156572, 2695715, 4313144, 5391430, 10782860, 21565720]

約数ペア:

[(1, 21565720), (2, 10782860), (4, 5391430), (5, 4313144), (8, 2695715), (10, 2156572), (11, 1960520), (20, 1078286), (22, 980260), (23, 937640), (40, 539143), (44, 490130), (46, 468820), (55, 392104), (88, 245065), (92, 234410), (110, 196052), (115, 187528), (184, 117205), (220, 98026), (230, 93764), (253, 85240), (440, 49013), (460, 46882), (506, 42620), (920, 23441), (1012, 21310), (1265, 17048), (2024, 10655), (2131, 10120), (2530, 8524), (4262, 5060)]