21335920

素因数分解:

$2^4\times 5^1\times {\mathrm{167}}^1\times {\mathrm{1597}}^1$

素因数の和:1777

約数の個数: 40

約数和(自身を含む): 49934304

約数和(自身を除く): 28598384

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 167, 334, 668, 835, 1336, 1597, 1670, 2672, 3194, 3340, 6388, 6680, 7985, 12776, 13360, 15970, 25552, 31940, 63880, 127760, 266699, 533398, 1066796, 1333495, 2133592, 2666990, 4267184, 5333980, 10667960, 21335920]

約数ペア:

[(1, 21335920), (2, 10667960), (4, 5333980), (5, 4267184), (8, 2666990), (10, 2133592), (16, 1333495), (20, 1066796), (40, 533398), (80, 266699), (167, 127760), (334, 63880), (668, 31940), (835, 25552), (1336, 15970), (1597, 13360), (1670, 12776), (2672, 7985), (3194, 6680), (3340, 6388)]