20401040

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{97}}^1\times {\mathrm{239}}^1$

素因数の和:360

約数の個数: 80

約数和(自身を含む): 52496640

約数和(自身を除く): 32095600

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 44, 55, 80, 88, 97, 110, 176, 194, 220, 239, 388, 440, 478, 485, 776, 880, 956, 970, 1067, 1195, 1552, 1912, 1940, 2134, 2390, 2629, 3824, 3880, 4268, 4780, 5258, 5335, 7760, 8536, 9560, 10516, 10670, 13145, 17072, 19120, 21032, 21340, 23183, 26290, 42064, 42680, 46366, 52580, 85360, 92732, 105160, 115915, 185464, 210320, 231830, 255013, 370928, 463660, 510026, 927320, 1020052, 1275065, 1854640, 2040104, 2550130, 4080208, 5100260, 10200520, 20401040]

約数ペア:

[(1, 20401040), (2, 10200520), (4, 5100260), (5, 4080208), (8, 2550130), (10, 2040104), (11, 1854640), (16, 1275065), (20, 1020052), (22, 927320), (40, 510026), (44, 463660), (55, 370928), (80, 255013), (88, 231830), (97, 210320), (110, 185464), (176, 115915), (194, 105160), (220, 92732), (239, 85360), (388, 52580), (440, 46366), (478, 42680), (485, 42064), (776, 26290), (880, 23183), (956, 21340), (970, 21032), (1067, 19120), (1195, 17072), (1552, 13145), (1912, 10670), (1940, 10516), (2134, 9560), (2390, 8536), (2629, 7760), (3824, 5335), (3880, 5258), (4268, 4780)]