20721940

素因数分解:

$2^2\times 5^1\times {\mathrm{53}}^1\times {\mathrm{113}}^1\times {\mathrm{173}}^1$

素因数の和:348

約数の個数: 48

約数和(自身を含む): 44988048

約数和(自身を除く): 24266108

約数列:

[1, 2, 4, 5, 10, 20, 53, 106, 113, 173, 212, 226, 265, 346, 452, 530, 565, 692, 865, 1060, 1130, 1730, 2260, 3460, 5989, 9169, 11978, 18338, 19549, 23956, 29945, 36676, 39098, 45845, 59890, 78196, 91690, 97745, 119780, 183380, 195490, 390980, 1036097, 2072194, 4144388, 5180485, 10360970, 20721940]

約数ペア:

[(1, 20721940), (2, 10360970), (4, 5180485), (5, 4144388), (10, 2072194), (20, 1036097), (53, 390980), (106, 195490), (113, 183380), (173, 119780), (212, 97745), (226, 91690), (265, 78196), (346, 59890), (452, 45845), (530, 39098), (565, 36676), (692, 29945), (865, 23956), (1060, 19549), (1130, 18338), (1730, 11978), (2260, 9169), (3460, 5989)]