20613760

素因数分解:

$2^7\times 5^1\times {\mathrm{31}}^1\times {\mathrm{1039}}^1$

素因数の和:1089

約数の個数: 64

約数和(自身を含む): 50918400

約数和(自身を除く): 30304640

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 64, 80, 124, 128, 155, 160, 248, 310, 320, 496, 620, 640, 992, 1039, 1240, 1984, 2078, 2480, 3968, 4156, 4960, 5195, 8312, 9920, 10390, 16624, 19840, 20780, 32209, 33248, 41560, 64418, 66496, 83120, 128836, 132992, 161045, 166240, 257672, 322090, 332480, 515344, 644180, 664960, 1030688, 1288360, 2061376, 2576720, 4122752, 5153440, 10306880, 20613760]

約数ペア:

[(1, 20613760), (2, 10306880), (4, 5153440), (5, 4122752), (8, 2576720), (10, 2061376), (16, 1288360), (20, 1030688), (31, 664960), (32, 644180), (40, 515344), (62, 332480), (64, 322090), (80, 257672), (124, 166240), (128, 161045), (155, 132992), (160, 128836), (248, 83120), (310, 66496), (320, 64418), (496, 41560), (620, 33248), (640, 32209), (992, 20780), (1039, 19840), (1240, 16624), (1984, 10390), (2078, 9920), (2480, 8312), (3968, 5195), (4156, 4960)]