20438920

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{53}}^1\times {\mathrm{311}}^1$

素因数の和:406

約数の個数: 64

約数和(自身を含む): 48522240

約数和(自身を除く): 28083320

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 53, 62, 106, 124, 155, 212, 248, 265, 310, 311, 424, 530, 620, 622, 1060, 1240, 1244, 1555, 1643, 2120, 2488, 3110, 3286, 6220, 6572, 8215, 9641, 12440, 13144, 16430, 16483, 19282, 32860, 32966, 38564, 48205, 65720, 65932, 77128, 82415, 96410, 131864, 164830, 192820, 329660, 385640, 510973, 659320, 1021946, 2043892, 2554865, 4087784, 5109730, 10219460, 20438920]

約数ペア:

[(1, 20438920), (2, 10219460), (4, 5109730), (5, 4087784), (8, 2554865), (10, 2043892), (20, 1021946), (31, 659320), (40, 510973), (53, 385640), (62, 329660), (106, 192820), (124, 164830), (155, 131864), (212, 96410), (248, 82415), (265, 77128), (310, 65932), (311, 65720), (424, 48205), (530, 38564), (620, 32966), (622, 32860), (1060, 19282), (1240, 16483), (1244, 16430), (1555, 13144), (1643, 12440), (2120, 9641), (2488, 8215), (3110, 6572), (3286, 6220)]