21089920

素因数分解:

$2^7\times 5^1\times {\mathrm{31}}^1\times {\mathrm{1063}}^1$

素因数の和:1113

約数の個数: 64

約数和(自身を含む): 52093440

約数和(自身を除く): 31003520

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, 1063, 1240, 1984, 2126, 2480, 3968, 4252, 4960, 5315, 8504, 9920, 10630, 17008, 19840, 21260, 32953, 34016, 42520, 65906, 68032, 85040, 131812, 136064, 164765, 170080, 263624, 329530, 340160, 527248, 659060, 680320, 1054496, 1318120, 2108992, 2636240, 4217984, 5272480, 10544960, 21089920]

約数ペア:

[(1, 21089920), (2, 10544960), (4, 5272480), (5, 4217984), (8, 2636240), (10, 2108992), (16, 1318120), (20, 1054496), (31, 680320), (32, 659060), (40, 527248), (62, 340160), (64, 329530), (80, 263624), (124, 170080), (128, 164765), (155, 136064), (160, 131812), (248, 85040), (310, 68032), (320, 65906), (496, 42520), (620, 34016), (640, 32953), (992, 21260), (1063, 19840), (1240, 17008), (1984, 10630), (2126, 9920), (2480, 8504), (3968, 5315), (4252, 4960)]