20961280

素因数分解:

$2^{11}\times 5^1\times {\mathrm{23}}^1\times {\mathrm{89}}^1$

素因数の和:139

約数の個数: 96

約数和(自身を含む): 53071200

約数和(自身を除く): 32109920

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 23, 32, 40, 46, 64, 80, 89, 92, 115, 128, 160, 178, 184, 230, 256, 320, 356, 368, 445, 460, 512, 640, 712, 736, 890, 920, 1024, 1280, 1424, 1472, 1780, 1840, 2047, 2048, 2560, 2848, 2944, 3560, 3680, 4094, 5120, 5696, 5888, 7120, 7360, 8188, 10235, 10240, 11392, 11776, 14240, 14720, 16376, 20470, 22784, 23552, 28480, 29440, 32752, 40940, 45568, 47104, 56960, 58880, 65504, 81880, 91136, 113920, 117760, 131008, 163760, 182272, 227840, 235520, 262016, 327520, 455680, 524032, 655040, 911360, 1048064, 1310080, 2096128, 2620160, 4192256, 5240320, 10480640, 20961280]

約数ペア:

[(1, 20961280), (2, 10480640), (4, 5240320), (5, 4192256), (8, 2620160), (10, 2096128), (16, 1310080), (20, 1048064), (23, 911360), (32, 655040), (40, 524032), (46, 455680), (64, 327520), (80, 262016), (89, 235520), (92, 227840), (115, 182272), (128, 163760), (160, 131008), (178, 117760), (184, 113920), (230, 91136), (256, 81880), (320, 65504), (356, 58880), (368, 56960), (445, 47104), (460, 45568), (512, 40940), (640, 32752), (712, 29440), (736, 28480), (890, 23552), (920, 22784), (1024, 20470), (1280, 16376), (1424, 14720), (1472, 14240), (1780, 11776), (1840, 11392), (2047, 10240), (2048, 10235), (2560, 8188), (2848, 7360), (2944, 7120), (3560, 5888), (3680, 5696), (4094, 5120)]