21645440

素因数分解:

$2^7\times 5^1\times {\mathrm{31}}^1\times {\mathrm{1091}}^1$

素因数の和:1141

約数の個数: 64

約数和(自身を含む): 53464320

約数和(自身を除く): 31818880

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, 1091, 1240, 1984, 2182, 2480, 3968, 4364, 4960, 5455, 8728, 9920, 10910, 17456, 19840, 21820, 33821, 34912, 43640, 67642, 69824, 87280, 135284, 139648, 169105, 174560, 270568, 338210, 349120, 541136, 676420, 698240, 1082272, 1352840, 2164544, 2705680, 4329088, 5411360, 10822720, 21645440]

約数ペア:

[(1, 21645440), (2, 10822720), (4, 5411360), (5, 4329088), (8, 2705680), (10, 2164544), (16, 1352840), (20, 1082272), (31, 698240), (32, 676420), (40, 541136), (62, 349120), (64, 338210), (80, 270568), (124, 174560), (128, 169105), (155, 139648), (160, 135284), (248, 87280), (310, 69824), (320, 67642), (496, 43640), (620, 34912), (640, 33821), (992, 21820), (1091, 19840), (1240, 17456), (1984, 10910), (2182, 9920), (2480, 8728), (3968, 5455), (4364, 4960)]