21399920

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{8629}}^1$

素因数の和:8673

約数の個数: 40

約数和(自身を含む): 51365760

約数和(自身を除く): 29965840

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 62, 80, 124, 155, 248, 310, 496, 620, 1240, 2480, 8629, 17258, 34516, 43145, 69032, 86290, 138064, 172580, 267499, 345160, 534998, 690320, 1069996, 1337495, 2139992, 2674990, 4279984, 5349980, 10699960, 21399920]

約数ペア:

[(1, 21399920), (2, 10699960), (4, 5349980), (5, 4279984), (8, 2674990), (10, 2139992), (16, 1337495), (20, 1069996), (31, 690320), (40, 534998), (62, 345160), (80, 267499), (124, 172580), (155, 138064), (248, 86290), (310, 69032), (496, 43145), (620, 34516), (1240, 17258), (2480, 8629)]