128814920

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{61}}^1\times {\mathrm{131}}^1$

素因数の和:247

約数の個数: 128

約数和(自身を含む): 329978880

約数和(自身を除く): 201163960

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 31, 40, 52, 61, 62, 65, 104, 122, 124, 130, 131, 155, 244, 248, 260, 262, 305, 310, 403, 488, 520, 524, 610, 620, 655, 793, 806, 1048, 1220, 1240, 1310, 1586, 1612, 1703, 1891, 2015, 2440, 2620, 3172, 3224, 3406, 3782, 3965, 4030, 4061, 5240, 6344, 6812, 7564, 7930, 7991, 8060, 8122, 8515, 9455, 13624, 15128, 15860, 15982, 16120, 16244, 17030, 18910, 20305, 24583, 31720, 31964, 32488, 34060, 37820, 39955, 40610, 49166, 52793, 63928, 68120, 75640, 79910, 81220, 98332, 103883, 105586, 122915, 159820, 162440, 196664, 207766, 211172, 245830, 247721, 263965, 319640, 415532, 422344, 491660, 495442, 519415, 527930, 831064, 983320, 990884, 1038830, 1055860, 1238605, 1981768, 2077660, 2111720, 2477210, 3220373, 4155320, 4954420, 6440746, 9908840, 12881492, 16101865, 25762984, 32203730, 64407460, 128814920]

約数ペア:

[(1, 128814920), (2, 64407460), (4, 32203730), (5, 25762984), (8, 16101865), (10, 12881492), (13, 9908840), (20, 6440746), (26, 4954420), (31, 4155320), (40, 3220373), (52, 2477210), (61, 2111720), (62, 2077660), (65, 1981768), (104, 1238605), (122, 1055860), (124, 1038830), (130, 990884), (131, 983320), (155, 831064), (244, 527930), (248, 519415), (260, 495442), (262, 491660), (305, 422344), (310, 415532), (403, 319640), (488, 263965), (520, 247721), (524, 245830), (610, 211172), (620, 207766), (655, 196664), (793, 162440), (806, 159820), (1048, 122915), (1220, 105586), (1240, 103883), (1310, 98332), (1586, 81220), (1612, 79910), (1703, 75640), (1891, 68120), (2015, 63928), (2440, 52793), (2620, 49166), (3172, 40610), (3224, 39955), (3406, 37820), (3782, 34060), (3965, 32488), (4030, 31964), (4061, 31720), (5240, 24583), (6344, 20305), (6812, 18910), (7564, 17030), (7930, 16244), (7991, 16120), (8060, 15982), (8122, 15860), (8515, 15128), (9455, 13624)]